CVE-2026-23161 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2026-23161 Interim 1 1 2026-03-05T00:17:10Z current 2026-03-05T00:17:10Z 2026-03-05T00:17:10Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2026-23161 In the Linux kernel, the following vulnerability has been resolved: mm/shmem, swap: fix race of truncate and swap entry split The helper for shmem swap freeing is not handling the order of swap entries correctly. It uses xa_cmpxchg_irq to erase the swap entry, but it gets the entry order before that using xa_get_order without lock protection, and it may get an outdated order value if the entry is split or changed in other ways after the xa_get_order and before the xa_cmpxchg_irq. And besides, the order could grow and be larger than expected, and cause truncation to erase data beyond the end border. For example, if the target entry and following entries are swapped in or freed, then a large folio was added in place and swapped out, using the same entry, the xa_cmpxchg_irq will still succeed, it's very unlikely to happen though. To fix that, open code the Xarray cmpxchg and put the order retrieval and value checking in the same critical section. Also, ensure the order won't exceed the end border, skip it if the entry goes across the border. Skipping large swap entries crosses the end border is safe here. Shmem truncate iterates the range twice, in the first iteration, find_lock_entries already filtered such entries, and shmem will swapin the entries that cross the end border and partially truncate the folio (split the folio or at least zero part of it). So in the second loop here, if we see a swap entry that crosses the end order, it must at least have its content erased already. I observed random swapoff hangs and kernel panics when stress testing ZSWAP with shmem. After applying this patch, all problems are gone. 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 Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Workstation Extension 15 SP7 SUSE Linux Enterprise High Availability Extension 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Development Tools 15 SP7 SUSE Linux Enterprise Module for Legacy 15 SP7 SUSE Linux Enterprise Module for Public Cloud 15 SP7 SUSE Linux Enterprise Live Patching 12 SP5 SUSE Linux Enterprise Live Patching 15 SP4 SUSE Linux Enterprise Live Patching 15 SP5 SUSE Linux Enterprise Live Patching 15 SP7 SUSE Linux Enterprise Micro 5.0 SUSE Linux Enterprise Micro 5.1 SUSE Linux Enterprise Micro 5.2 SUSE Linux 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Leap 15.6 kernel-default-vdso as a component of openSUSE Leap 15.6 kselftests-kmp-default as a component of openSUSE Leap 15.6 ocfs2-kmp-default as a component of openSUSE Leap 15.6 reiserfs-kmp-default as a component of openSUSE Leap 15.6 kernel-devel as a component of openSUSE Leap 15.6 kernel-macros as a component of openSUSE Leap 15.6 kernel-source as a component of openSUSE Leap 15.6 kernel-source-vanilla as a component of openSUSE Leap 15.6 kernel-devel-azure as a component of openSUSE Leap 15.6 kernel-source-azure as a component of openSUSE Leap 15.6 kernel-devel-rt as a component of openSUSE Leap 15.6 kernel-source-rt as a component of openSUSE Leap 15.6 In the Linux kernel, the following vulnerability has been resolved: mm/shmem, swap: fix race of truncate and swap entry split The helper for shmem swap freeing is not handling the order of swap entries correctly. It uses xa_cmpxchg_irq to erase the swap entry, but it gets the entry order before that using xa_get_order without lock protection, and it may get an outdated order value if the entry is split or changed in other ways after the xa_get_order and before the xa_cmpxchg_irq. And besides, the order could grow and be larger than expected, and cause truncation to erase data beyond the end border. For example, if the target entry and following entries are swapped in or freed, then a large folio was added in place and swapped out, using the same entry, the xa_cmpxchg_irq will still succeed, it's very unlikely to happen though. To fix that, open code the Xarray cmpxchg and put the order retrieval and value checking in the same critical section. Also, ensure the order won't exceed the end border, skip it if the entry goes across the border. Skipping large swap entries crosses the end border is safe here. Shmem truncate iterates the range twice, in the first iteration, find_lock_entries already filtered such entries, and shmem will swapin the entries that cross the end border and partially truncate the folio (split the folio or at least zero part of it). So in the second loop here, if we see a swap entry that crosses the end order, it must at least have its content erased already. I observed random swapoff hangs and kernel panics when stress testing ZSWAP with shmem. After applying this patch, all problems are gone. CVE-2026-23161 SUSE Linux Enterprise High Availability Extension 15 SP7:cluster-md-kmp-default SUSE Linux Enterprise High Availability Extension 15 SP7:dlm-kmp-default SUSE Linux Enterprise High Availability Extension 15 SP7:gfs2-kmp-default SUSE Linux Enterprise High Availability Extension 15 SP7:kernel-default SUSE Linux Enterprise High Availability Extension 15 SP7:kernel-source SUSE Linux Enterprise High Availability Extension 15 SP7:ocfs2-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 High Performance Computing 15 SP5-LTSS:cluster-md-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:dlm-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:gfs2-kmp-default SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:kernel-default SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:kernel-default-devel SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:kernel-devel SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:kernel-macros SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:kernel-source SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS:ocfs2-kmp-default SUSE Linux Enterprise Live Patching 12 SP5:kernel-default SUSE Linux Enterprise Live Patching 12 SP5:kernel-default-kgraft SUSE Linux Enterprise Live Patching 12 SP5:kernel-default-kgraft-devel SUSE Linux Enterprise Live Patching 12 SP5:kernel-source SUSE Linux Enterprise Live Patching 15 SP4:kernel-default SUSE Linux Enterprise Live Patching 15 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SP7:kernel-default SUSE Linux Enterprise Module for Development Tools 15 SP7:kernel-source SUSE Linux Enterprise Module for Legacy 15 SP7:kernel-default SUSE Linux Enterprise Module for Legacy 15 SP7:kernel-source SUSE Linux Enterprise Module for Legacy 15 SP7:reiserfs-kmp-default SUSE Linux Enterprise Module for Public Cloud 15 SP7:kernel-devel-azure SUSE Linux Enterprise Module for Public Cloud 15 SP7:kernel-source-azure 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 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 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SP5-LTSS:gfs2-kmp-default SUSE Linux Enterprise Server 15 SP5-LTSS:kernel-default SUSE Linux Enterprise Server 15 SP5-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15 SP5-LTSS:kernel-devel SUSE Linux Enterprise Server 15 SP5-LTSS:kernel-macros SUSE Linux Enterprise Server 15 SP5-LTSS:kernel-source SUSE Linux Enterprise Server 15 SP5-LTSS:ocfs2-kmp-default SUSE Linux Enterprise Server 15 SP5-LTSS:reiserfs-kmp-default SUSE Linux Enterprise Server 15 SP6-LTSS:cluster-md-kmp-default SUSE Linux Enterprise Server 15 SP6-LTSS:dlm-kmp-default SUSE Linux Enterprise Server 15 SP6-LTSS:gfs2-kmp-default SUSE Linux Enterprise Server 15 SP6-LTSS:kernel-default SUSE Linux Enterprise Server 15 SP6-LTSS:kernel-default-devel SUSE Linux Enterprise Server 15 SP6-LTSS:kernel-devel SUSE Linux Enterprise Server 15 SP6-LTSS:kernel-macros SUSE Linux Enterprise Server 15 SP6-LTSS:kernel-source SUSE Linux Enterprise Server 15 SP6-LTSS:ocfs2-kmp-default SUSE Linux Enterprise Server 15 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SP5:kernel-default SUSE Linux Enterprise Server for SAP Applications 15 SP5:kernel-default-devel SUSE Linux Enterprise Server for SAP Applications 15 SP5:kernel-devel SUSE Linux Enterprise Server for SAP Applications 15 SP5:kernel-macros SUSE Linux Enterprise Server for SAP Applications 15 SP5:kernel-source SUSE Linux Enterprise Server for SAP Applications 15 SP5:ocfs2-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP5:reiserfs-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP6:cluster-md-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP6:dlm-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP6:gfs2-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP6:kernel-default SUSE Linux Enterprise Server for SAP Applications 15 SP6:kernel-default-devel SUSE Linux Enterprise Server for SAP Applications 15 SP6:kernel-devel SUSE Linux Enterprise Server for SAP Applications 15 SP6:kernel-macros SUSE Linux Enterprise Server for SAP Applications 15 SP6:kernel-source SUSE Linux Enterprise Server for SAP Applications 15 SP6:ocfs2-kmp-default SUSE Linux Enterprise Server for SAP Applications 15 SP6:reiserfs-kmp-default SUSE Linux Enterprise Workstation Extension 15 SP7:kernel-default SUSE Linux Enterprise Workstation Extension 15 SP7:kernel-default-extra SUSE Linux Enterprise Workstation Extension 15 SP7:kernel-source SUSE Linux Micro 6.0:kernel-default SUSE Linux Micro 6.0:kernel-devel SUSE Linux Micro 6.0:kernel-devel-rt SUSE Linux Micro 6.0:kernel-macros SUSE Linux Micro 6.0:kernel-source SUSE Linux Micro 6.0:kernel-source-rt SUSE Linux Micro 6.1:kernel-default SUSE Linux Micro 6.1:kernel-devel SUSE Linux Micro 6.1:kernel-devel-rt SUSE Linux Micro 6.1:kernel-macros SUSE Linux Micro 6.1:kernel-source SUSE Linux Micro 6.1:kernel-source-rt SUSE Real Time Module 15 SP7:kernel-devel-rt SUSE Real Time Module 15 SP7:kernel-source-rt openSUSE Leap 15.6:cluster-md-kmp-default openSUSE Leap 15.6:dlm-kmp-default openSUSE Leap 15.6:gfs2-kmp-default openSUSE Leap 15.6:kernel-default openSUSE Leap 15.6:kernel-default-devel openSUSE Leap 15.6:kernel-default-extra openSUSE Leap 15.6:kernel-default-livepatch openSUSE Leap 15.6:kernel-default-livepatch-devel openSUSE Leap 15.6:kernel-default-optional openSUSE Leap 15.6:kernel-default-vdso openSUSE Leap 15.6:kernel-devel openSUSE Leap 15.6:kernel-devel-azure openSUSE Leap 15.6:kernel-devel-rt openSUSE Leap 15.6:kernel-macros openSUSE Leap 15.6:kernel-source openSUSE Leap 15.6:kernel-source-azure openSUSE Leap 15.6:kernel-source-rt openSUSE Leap 15.6:kernel-source-vanilla openSUSE Leap 15.6:kselftests-kmp-default openSUSE Leap 15.6:ocfs2-kmp-default openSUSE Leap 15.6:reiserfs-kmp-default important 7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H