CVE-2021-46910 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2021-46910 Interim 1 9 2025-03-12T01:38:41Z current 2024-02-28T00:37:02Z 2025-03-12T01:38:41Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2021-46910 In the Linux kernel, the following vulnerability has been resolved: ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUG_KMAP_LOCAL is enabled The debugging code for kmap_local() doubles the number of per-CPU fixmap slots allocated for kmap_local(), in order to use half of them as guard regions. This causes the fixmap region to grow downwards beyond the start of its reserved window if the supported number of CPUs is large, and collide with the newly added virtual DT mapping right below it, which is obviously not good. One manifestation of this is EFI boot on a kernel built with NR_CPUS=32 and CONFIG_DEBUG_KMAP_LOCAL=y, which may pass the FDT in highmem, resulting in block entries below the fixmap region that the fixmap code misidentifies as fixmap table entries, and subsequently tries to dereference using a phys-to-virt translation that is only valid for lowmem. This results in a cryptic splat such as the one below. ftrace: allocating 45548 entries in 89 pages 8<--- cut here --- Unable to handle kernel paging request at virtual address fc6006f0 pgd = (ptrval) [fc6006f0] *pgd=80000040207003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 5.11.0+ #382 Hardware name: Generic DT based system PC is at cpu_ca15_set_pte_ext+0x24/0x30 LR is at __set_fixmap+0xe4/0x118 pc : [<c041ac9c>] lr : [<c04189d8>] psr: 400000d3 sp : c1601ed8 ip : 00400000 fp : 00800000 r10: 0000071f r9 : 00421000 r8 : 00c00000 r7 : 00c00000 r6 : 0000071f r5 : ffade000 r4 : 4040171f r3 : 00c00000 r2 : 4040171f r1 : c041ac78 r0 : fc6006f0 Flags: nZcv IRQs off FIQs off Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 40203000 DAC: 00000001 Process swapper (pid: 0, stack limit = 0x(ptrval)) So let's limit CONFIG_NR_CPUS to 16 when CONFIG_DEBUG_KMAP_LOCAL=y. Also, fix the BUILD_BUG_ON() check that was supposed to catch this, by checking whether the region grows below the start address rather than above the end address. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://www.suse.com/support/security/rating/ SUSE Security Ratings SUSE CaaS Platform 4.0 SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Enterprise Storage 7.1 SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Development Tools 15 SP5 SUSE Linux Enterprise High Performance Computing 12 SP5 SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Development Tools 15 SP5 SUSE Linux Enterprise Module for Public Cloud 15 SP5 SUSE Linux Enterprise Micro 5.0 SUSE Linux Enterprise Micro 5.1 SUSE Linux Enterprise Micro 5.2 SUSE Linux Enterprise Micro 5.3 SUSE Linux Enterprise Micro 5.4 SUSE Linux Enterprise Micro 5.5 SUSE Linux Enterprise Real Time 12 SP5 SUSE Real Time Module 15 SP5 SUSE Linux Enterprise Server 11 SP4 LTSS SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE SUSE Linux Enterprise Server 12 SP2-LTSS SUSE Linux Enterprise Server 12 SP4-LTSS SUSE Linux Enterprise Server 12 SP5 SUSE Linux Enterprise Server 15 SP1-LTSS SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Linux Enterprise Server 15 SP2-LTSS SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Server 15 SP3-LTSS SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Linux Enterprise Server 15 SP4-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Development Tools 15 SP5 SUSE Linux Enterprise Module for Public Cloud 15 SP5 SUSE Linux Enterprise Server 15-LTSS SUSE Linux Enterprise Server Teradata 12 SP3 SUSE Linux Enterprise Server Teradata 12 SP3-LTSS SUSE Linux Enterprise Server for SAP Applications 12 SP2 SUSE Linux Enterprise Server for SAP Applications 12 SP4 SUSE Linux Enterprise Server for SAP Applications 12 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP1 SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Linux Enterprise Server for SAP Applications 15 SP2 SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Server for SAP Applications 15 SP3 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Module for Development Tools 15 SP5 SUSE Linux Enterprise Module for Public Cloud 15 SP5 SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Manager Proxy 4.3 SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Manager Retail Branch Server 4.3 SUSE Linux Enterprise Module for Public Cloud 15 SP2 SUSE Linux Enterprise Module for Public Cloud 15 SP3 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Manager Server 4.3 SUSE OpenStack Cloud 9 SUSE OpenStack Cloud Crowbar 9 kernel-default kernel-default-base kernel-default-devel kernel-default-man kernel-devel kernel-devel-azure kernel-devel-rt kernel-macros kernel-rt kernel-source kernel-source-azure kernel-source-rt reiserfs-kmp-default kernel-default as a component of SUSE CaaS Platform 4.0 kernel-default-base as a component of SUSE CaaS Platform 4.0 kernel-default-devel as a component of SUSE CaaS Platform 4.0 reiserfs-kmp-default as a component of SUSE CaaS Platform 4.0 kernel-devel as a component of SUSE CaaS Platform 4.0 kernel-macros as a component of SUSE CaaS Platform 4.0 kernel-source as a component of SUSE CaaS Platform 4.0 kernel-default as a component of SUSE Enterprise Storage 7.1 kernel-default-devel as a component of SUSE Enterprise Storage 7.1 reiserfs-kmp-default as a component of SUSE Enterprise Storage 7.1 kernel-devel as a component of SUSE Enterprise Storage 7.1 kernel-macros as a component of SUSE Enterprise Storage 7.1 kernel-source as a component of SUSE Enterprise Storage 7.1 kernel-default as a component of SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source as a component of SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source-azure as a component of SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-default-base as a component of SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS reiserfs-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-devel as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-macros as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source as a component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default as a component of SUSE Linux Enterprise Micro 5.0 kernel-default as a component of SUSE Linux Enterprise Micro 5.1 kernel-rt as a component of SUSE Linux Enterprise Micro 5.1 kernel-source-rt as a component of SUSE Linux Enterprise Micro 5.1 kernel-default as a component of SUSE Linux Enterprise Micro 5.2 kernel-rt as a component of SUSE Linux Enterprise Micro 5.2 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15 SP5 kernel-default as a component of SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source as a component of SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP2 kernel-source-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP3 kernel-source-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP4 kernel-devel-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP5 kernel-source-azure as a component of SUSE Linux Enterprise Module for Public Cloud 15 SP5 kernel-devel-rt as a component of SUSE Linux Enterprise Real Time 12 SP5 kernel-source-rt as a component of SUSE Linux Enterprise Real Time 12 SP5 kernel-default as a component of SUSE Linux Enterprise Server 11 SP4 LTSS kernel-source as a component of SUSE Linux Enterprise Server 11 SP4 LTSS kernel-default as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default-base as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default-devel as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source as a component of SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-source as a component of SUSE Linux Enterprise Server 12 SP2-LTSS kernel-default as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-source as a component of SUSE Linux Enterprise Server 12 SP4-LTSS kernel-default as a component of SUSE Linux Enterprise Server 12 SP5 kernel-default-base as a component of SUSE Linux Enterprise Server 12 SP5 kernel-default-devel as a component of SUSE Linux Enterprise Server 12 SP5 kernel-default-man as a component of SUSE Linux Enterprise Server 12 SP5 kernel-devel as a component of SUSE Linux Enterprise Server 12 SP5 kernel-macros as a component of SUSE Linux Enterprise Server 12 SP5 kernel-source as a component of SUSE Linux Enterprise Server 12 SP5 kernel-devel-azure as a component of SUSE Linux Enterprise Server 12 SP5 kernel-source-azure as a component of SUSE Linux Enterprise Server 12 SP5 kernel-default as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 15 SP1-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP2-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP3-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP4-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default-base as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default-man as a component of SUSE Linux Enterprise Server 15-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15-LTSS kernel-default as a component of SUSE Linux Enterprise Server Teradata 12 SP3 kernel-source as a component of SUSE Linux Enterprise Server Teradata 12 SP3 kernel-default as a component of SUSE Linux Enterprise Server Teradata 12 SP3-LTSS kernel-source as a component of SUSE Linux Enterprise Server Teradata 12 SP3-LTSS kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-default-base as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP2 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-default-base as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP4 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-source-azure as a component of SUSE Linux Enterprise Server for SAP Applications 12 SP5 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-default-base as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP2 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default as a component of SUSE Manager Proxy 4.3 kernel-default-devel as a component of SUSE Manager Proxy 4.3 kernel-devel as a component of SUSE Manager Proxy 4.3 kernel-macros as a component of SUSE Manager Proxy 4.3 kernel-source as a component of SUSE Manager Proxy 4.3 kernel-default as a component of SUSE Manager Retail Branch Server 4.3 kernel-default-devel as a component of SUSE Manager Retail Branch Server 4.3 kernel-devel as a component of SUSE Manager Retail Branch Server 4.3 kernel-macros as a component of SUSE Manager Retail Branch Server 4.3 kernel-source as a component of SUSE Manager Retail Branch Server 4.3 kernel-default as a component of SUSE Manager Server 4.3 kernel-default-devel as a component of SUSE Manager Server 4.3 kernel-devel as a component of SUSE Manager Server 4.3 kernel-macros as a component of SUSE Manager Server 4.3 kernel-source as a component of SUSE Manager Server 4.3 kernel-default as a component of SUSE OpenStack Cloud 9 kernel-default-base as a component of SUSE OpenStack Cloud 9 kernel-default-devel as a component of SUSE OpenStack Cloud 9 kernel-devel as a component of SUSE OpenStack Cloud 9 kernel-macros as a component of SUSE OpenStack Cloud 9 kernel-source as a component of SUSE OpenStack Cloud 9 kernel-default as a component of SUSE OpenStack Cloud Crowbar 9 kernel-default-base as a component of SUSE OpenStack Cloud Crowbar 9 kernel-default-devel as a component of SUSE OpenStack Cloud Crowbar 9 kernel-devel as a component of SUSE OpenStack Cloud Crowbar 9 kernel-macros as a component of SUSE OpenStack Cloud Crowbar 9 kernel-source as a component of SUSE OpenStack Cloud Crowbar 9 kernel-devel-rt as a component of SUSE Real Time Module 15 SP5 kernel-source-rt as a component of SUSE Real Time Module 15 SP5 In the Linux kernel, the following vulnerability has been resolved: ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUG_KMAP_LOCAL is enabled The debugging code for kmap_local() doubles the number of per-CPU fixmap slots allocated for kmap_local(), in order to use half of them as guard regions. This causes the fixmap region to grow downwards beyond the start of its reserved window if the supported number of CPUs is large, and collide with the newly added virtual DT mapping right below it, which is obviously not good. One manifestation of this is EFI boot on a kernel built with NR_CPUS=32 and CONFIG_DEBUG_KMAP_LOCAL=y, which may pass the FDT in highmem, resulting in block entries below the fixmap region that the fixmap code misidentifies as fixmap table entries, and subsequently tries to dereference using a phys-to-virt translation that is only valid for lowmem. This results in a cryptic splat such as the one below. ftrace: allocating 45548 entries in 89 pages 8<--- cut here --- Unable to handle kernel paging request at virtual address fc6006f0 pgd = (ptrval) [fc6006f0] *pgd=80000040207003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 5.11.0+ #382 Hardware name: Generic DT based system PC is at cpu_ca15_set_pte_ext+0x24/0x30 LR is at __set_fixmap+0xe4/0x118 pc : [<c041ac9c>] lr : [<c04189d8>] psr: 400000d3 sp : c1601ed8 ip : 00400000 fp : 00800000 r10: 0000071f r9 : 00421000 r8 : 00c00000 r7 : 00c00000 r6 : 0000071f r5 : ffade000 r4 : 4040171f r3 : 00c00000 r2 : 4040171f r1 : c041ac78 r0 : fc6006f0 Flags: nZcv IRQs off FIQs off Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 40203000 DAC: 00000001 Process swapper (pid: 0, stack limit = 0x(ptrval)) So let's limit CONFIG_NR_CPUS to 16 when CONFIG_DEBUG_KMAP_LOCAL=y. Also, fix the BUILD_BUG_ON() check that was supposed to catch this, by checking whether the region grows below the start address rather than above the end address. CVE-2021-46910 SUSE CaaS Platform 4.0:kernel-default SUSE CaaS Platform 4.0:kernel-default-base SUSE CaaS Platform 4.0:kernel-default-devel SUSE CaaS Platform 4.0:kernel-devel SUSE CaaS Platform 4.0:kernel-macros SUSE CaaS Platform 4.0:kernel-source SUSE CaaS Platform 4.0:reiserfs-kmp-default SUSE Enterprise Storage 7.1:kernel-default SUSE Enterprise Storage 7.1:kernel-default-devel SUSE Enterprise Storage 7.1:kernel-devel SUSE Enterprise Storage 7.1:kernel-macros SUSE Enterprise Storage 7.1:kernel-source SUSE Enterprise Storage 7.1:reiserfs-kmp-default SUSE Linux Enterprise High Performance Computing 12 SP5:kernel-default SUSE Linux Enterprise High Performance Computing 12 SP5:kernel-source SUSE Linux Enterprise High Performance Computing 12 SP5:kernel-source-azure SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS:kernel-default-base SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS:kernel-macros SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS:kernel-source SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:kernel-macros SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS:kernel-source SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS:kernel-macros SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS:kernel-source SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS:reiserfs-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-macros SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:kernel-source SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:reiserfs-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-macros SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:kernel-source SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Micro 5.0:kernel-default SUSE Linux Enterprise Micro 5.1:kernel-default SUSE Linux Enterprise Micro 5.1:kernel-rt SUSE Linux Enterprise Micro 5.1:kernel-source-rt SUSE Linux Enterprise Micro 5.2:kernel-default SUSE Linux Enterprise Micro 5.2:kernel-rt SUSE Linux Enterprise Micro 5.2:kernel-source-rt SUSE Linux Enterprise Micro 5.3:kernel-default SUSE Linux Enterprise Micro 5.3:kernel-rt SUSE Linux Enterprise Micro 5.3:kernel-source-rt SUSE Linux Enterprise Micro 5.4:kernel-default SUSE Linux Enterprise Micro 5.4:kernel-rt SUSE Linux Enterprise Micro 5.4:kernel-source-rt SUSE Linux Enterprise Micro 5.5:kernel-devel-rt SUSE Linux Enterprise Micro 5.5:kernel-source-rt SUSE Linux Enterprise Module for Basesystem 15 SP5:kernel-default SUSE Linux Enterprise Module for Basesystem 15 SP5:kernel-default-devel SUSE Linux Enterprise Module for Basesystem 15 SP5:kernel-devel SUSE Linux Enterprise Module for Basesystem 15 SP5:kernel-macros SUSE Linux Enterprise Module for Basesystem 15 SP5:kernel-source SUSE Linux Enterprise Module for Development Tools 15 SP5:kernel-default SUSE Linux Enterprise Module for Development Tools 15 SP5:kernel-source SUSE Linux Enterprise Module for Public Cloud 15 SP2:kernel-source-azure SUSE Linux Enterprise Module for Public Cloud 15 SP3:kernel-source-azure SUSE Linux Enterprise Module for Public Cloud 15 SP4:kernel-source-azure SUSE Linux Enterprise Module for Public Cloud 15 SP5:kernel-devel-azure SUSE Linux Enterprise Module for Public Cloud 15 SP5:kernel-source-azure SUSE Linux Enterprise Real Time 12 SP5:kernel-devel-rt SUSE Linux Enterprise Real Time 12 SP5:kernel-source-rt SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE:kernel-default SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE:kernel-default-base SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE:kernel-default-devel SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE:kernel-source SUSE Linux Enterprise Server 11 SP4 LTSS:kernel-default SUSE Linux Enterprise Server 11 SP4 LTSS:kernel-source SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-default SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-default-base SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-default-devel SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-default-man SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-devel SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-macros SUSE Linux Enterprise Server 12 SP2-LTSS:kernel-source SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-default SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-default-base SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-default-devel SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-default-man SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-devel SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-macros SUSE Linux Enterprise Server 12 SP4-LTSS:kernel-source SUSE Linux Enterprise Server 12 SP5:kernel-default SUSE Linux Enterprise Server 12 SP5:kernel-default-base SUSE Linux Enterprise Server 12 SP5:kernel-default-devel SUSE Linux Enterprise Server 12 SP5:kernel-default-man SUSE Linux Enterprise Server 12 SP5:kernel-devel SUSE Linux Enterprise Server 12 SP5:kernel-devel-azure SUSE Linux Enterprise Server 12 SP5:kernel-macros SUSE Linux Enterprise Server 12 SP5:kernel-source SUSE Linux Enterprise Server 12 SP5:kernel-source-azure SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-default SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-default-base SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-default-man SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-devel SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-macros SUSE Linux Enterprise Server 15 SP1-LTSS:kernel-source SUSE Linux Enterprise Server 15 SP1-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Server 15 SP2-LTSS:kernel-default SUSE Linux Enterprise Server 15 SP2-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15 SP2-LTSS:kernel-devel SUSE Linux Enterprise Server 15 SP2-LTSS:kernel-macros SUSE Linux Enterprise Server 15 SP2-LTSS:kernel-source SUSE Linux Enterprise Server 15 SP2-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Server 15 SP3-LTSS:kernel-default SUSE Linux Enterprise Server 15 SP3-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15 SP3-LTSS:kernel-devel SUSE Linux Enterprise Server 15 SP3-LTSS:kernel-macros SUSE Linux Enterprise Server 15 SP3-LTSS:kernel-source SUSE Linux Enterprise Server 15 SP3-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-default SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-devel SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-macros SUSE Linux Enterprise Server 15 SP4-LTSS:kernel-source SUSE Linux Enterprise Server 15 SP4-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Server 15-LTSS:kernel-default SUSE Linux Enterprise Server 15-LTSS:kernel-default-base SUSE Linux Enterprise Server 15-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15-LTSS:kernel-default-man SUSE Linux Enterprise Server 15-LTSS:kernel-devel SUSE Linux Enterprise Server 15-LTSS:kernel-macros SUSE Linux Enterprise Server 15-LTSS:kernel-source SUSE Linux Enterprise Server 15-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Server Teradata 12 SP3-LTSS:kernel-default SUSE Linux Enterprise Server Teradata 12 SP3-LTSS:kernel-source SUSE Linux Enterprise Server Teradata 12 SP3:kernel-default SUSE Linux Enterprise Server Teradata 12 SP3:kernel-source SUSE Linux Enterprise Server for SAP Applications 12 SP2:kernel-default SUSE Linux Enterprise Server for SAP Applications 12 SP2:kernel-default-base SUSE Linux Enterprise Server for SAP Applications 12 SP2:kernel-default-devel SUSE Linux Enterprise Server for SAP Applications 12 SP2:kernel-devel SUSE Linux Enterprise Server for SAP Applications 12 SP2:kernel-macros SUSE Linux Enterprise Server for SAP Applications 12 SP2:kernel-source SUSE Linux Enterprise Server for SAP Applications 12 SP4:kernel-default SUSE Linux Enterprise Server for SAP Applications 12 SP4:kernel-default-base SUSE Linux Enterprise Server for SAP Applications 12 SP4:kernel-default-devel SUSE Linux Enterprise Server for SAP Applications 12 SP4:kernel-devel SUSE Linux Enterprise Server for SAP Applications 12 SP4:kernel-macros SUSE Linux Enterprise Server for SAP Applications 12 SP4:kernel-source SUSE Linux Enterprise Server for SAP Applications 12 SP5:kernel-default SUSE Linux Enterprise Server for SAP Applications 12 SP5:kernel-source SUSE Linux Enterprise Server for SAP Applications 12 SP5:kernel-source-azure SUSE Linux Enterprise Server for SAP Applications 15 SP1:kernel-default SUSE Linux Enterprise Server for SAP Applications 15 SP1:kernel-default-base SUSE Linux Enterprise Server for SAP Applications 15 SP1:kernel-default-devel SUSE Linux Enterprise Server for SAP Applications 15 SP1:kernel-devel SUSE Linux Enterprise 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SUSE Linux Enterprise Server for SAP Applications 15 SP3:reiserfs-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-default SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-default-devel SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-devel SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-macros SUSE Linux Enterprise Server for SAP Applications 15 SP4:kernel-source SUSE Linux Enterprise Server for SAP Applications 15 SP4:reiserfs-kmp-default SUSE Manager Proxy 4.3:kernel-default SUSE Manager Proxy 4.3:kernel-default-devel SUSE Manager Proxy 4.3:kernel-devel SUSE Manager Proxy 4.3:kernel-macros SUSE Manager Proxy 4.3:kernel-source SUSE Manager Retail Branch Server 4.3:kernel-default SUSE Manager Retail Branch Server 4.3:kernel-default-devel SUSE Manager Retail Branch Server 4.3:kernel-devel SUSE Manager Retail Branch Server 4.3:kernel-macros SUSE Manager Retail Branch Server 4.3:kernel-source SUSE Manager Server 4.3:kernel-default SUSE Manager Server 4.3:kernel-default-devel SUSE Manager Server 4.3:kernel-devel SUSE Manager Server 4.3:kernel-macros SUSE Manager Server 4.3:kernel-source SUSE OpenStack Cloud 9:kernel-default SUSE OpenStack Cloud 9:kernel-default-base SUSE OpenStack Cloud 9:kernel-default-devel SUSE OpenStack Cloud 9:kernel-devel SUSE OpenStack Cloud 9:kernel-macros SUSE OpenStack Cloud 9:kernel-source SUSE OpenStack Cloud Crowbar 9:kernel-default SUSE OpenStack Cloud Crowbar 9:kernel-default-base SUSE OpenStack Cloud Crowbar 9:kernel-default-devel SUSE OpenStack Cloud Crowbar 9:kernel-devel SUSE OpenStack Cloud Crowbar 9:kernel-macros SUSE OpenStack Cloud Crowbar 9:kernel-source SUSE Real Time Module 15 SP5:kernel-devel-rt SUSE Real Time Module 15 SP5:kernel-source-rt moderate 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H