CVE-2025-39901 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2025-39901 Interim 1 3 2026-03-05T00:43:47Z current 2025-10-04T23:16:06Z 2026-03-05T00:43:47Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2025-39901 In the Linux kernel, the following vulnerability has been resolved: i40e: remove read access to debugfs files The 'command' and 'netdev_ops' debugfs files are a legacy debugging interface supported by the i40e driver since its early days by commit 02e9c290814c ("i40e: debugfs interface"). Both of these debugfs files provide a read handler which is mostly useless, and which is implemented with questionable logic. They both use a static 256 byte buffer which is initialized to the empty string. In the case of the 'command' file this buffer is literally never used and simply wastes space. In the case of the 'netdev_ops' file, the last command written is saved here. On read, the files contents are presented as the name of the device followed by a colon and then the contents of their respective static buffer. For 'command' this will always be "<device>: ". For 'netdev_ops', this will be "<device>: <last command written>". But note the buffer is shared between all devices operated by this module. At best, it is mostly meaningless information, and at worse it could be accessed simultaneously as there doesn't appear to be any locking mechanism. We have also recently received multiple reports for both read functions about their use of snprintf and potential overflow that could result in reading arbitrary kernel memory. For the 'command' file, this is definitely impossible, since the static buffer is always zero and never written to. For the 'netdev_ops' file, it does appear to be possible, if the user carefully crafts the command input, it will be copied into the buffer, which could be large enough to cause snprintf to truncate, which then causes the copy_to_user to read beyond the length of the buffer allocated by kzalloc. A minimal fix would be to replace snprintf() with scnprintf() which would cap the return to the number of bytes written, preventing an overflow. A more involved fix would be to drop the mostly useless static buffers, saving 512 bytes and modifying the read functions to stop needing those as input. Instead, lets just completely drop the read access to these files. These are debug interfaces exposed as part of debugfs, and I don't believe that dropping read access will break any script, as the provided output is pretty useless. You can find the netdev name through other more standard interfaces, and the 'netdev_ops' interface can easily result in garbage if you issue simultaneous writes to multiple devices at once. In order to properly remove the i40e_dbg_netdev_ops_buf, we need to refactor its write function to avoid using the static buffer. Instead, use the same logic as the i40e_dbg_command_write, with an allocated buffer. Update the code to use this instead of the static buffer, and ensure we free the buffer on exit. This fixes simultaneous writes to 'netdev_ops' on multiple devices, and allows us to remove the now unused static buffer along with removing the read access. 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 SLES-LTSS-TERADATA 15 SP2 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Workstation Extension 15 SP6 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 SP3-LTSS SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Development Tools 15 SP6 SUSE Linux Enterprise Module for Legacy 15 SP6 SUSE Linux Enterprise Module for Public Cloud 15 SP6 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 SP3 SUSE Linux Enterprise Live Patching 15 SP4 SUSE Linux Enterprise Live Patching 15 SP5 SUSE Linux Enterprise Live Patching 15 SP6 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 Enterprise Micro 5.3 SUSE Linux Enterprise Micro 5.4 SUSE Linux Enterprise Micro 5.5 SUSE Real Time Module 15 SP6 SUSE Real Time Module 15 SP7 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-LTSS SUSE Linux Enterprise Server 12 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Enterprise Server 15 SP5-LTSS gfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default-devel as a component of SUSE Linux Enterprise Server 15 SP5-LTSS ocfs2-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS reiserfs-kmp-default as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-devel as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-macros as a component of SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source as a component of SUSE Linux Enterprise Server 15 SP5-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 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Applications 15 SP4 kernel-source as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP4 cluster-md-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 dlm-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 gfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 ocfs2-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 reiserfs-kmp-default as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-devel as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-macros as a component of SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source as a component of SUSE Linux Enterprise 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component of SUSE Linux Micro 6.1 kernel-source as a component of SUSE Linux Micro 6.1 kernel-devel-rt as a component of SUSE Linux Micro 6.1 kernel-source-rt as a component of SUSE Linux Micro 6.1 kernel-default as a component of SUSE Manager Proxy LTS 4.3 kernel-default-devel as a component of SUSE Manager Proxy LTS 4.3 kernel-devel as a component of SUSE Manager Proxy LTS 4.3 kernel-macros as a component of SUSE Manager Proxy LTS 4.3 kernel-source as a component of SUSE Manager Proxy LTS 4.3 kernel-default as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-default-devel as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-devel as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-macros as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-source as a component of SUSE Manager Retail Branch Server LTS 4.3 kernel-default as a component of SUSE Manager Server LTS 4.3 kernel-default-devel as a component of SUSE Manager Server LTS 4.3 kernel-devel as a component of SUSE Manager Server LTS 4.3 kernel-macros as a component of SUSE Manager Server LTS 4.3 kernel-source as a component of SUSE Manager Server LTS 4.3 kernel-devel-rt as a component of SUSE Real Time Module 15 SP6 kernel-source-rt as a component of SUSE Real Time Module 15 SP6 kernel-devel-rt as a component of SUSE Real Time Module 15 SP7 kernel-source-rt as a component of SUSE Real Time Module 15 SP7 cluster-md-kmp-default as a component of openSUSE Leap 15.6 dlm-kmp-default as a component of openSUSE Leap 15.6 gfs2-kmp-default as a component of openSUSE Leap 15.6 kernel-default as a component of openSUSE Leap 15.6 kernel-default-devel as a component of openSUSE Leap 15.6 kernel-default-extra as a component of openSUSE Leap 15.6 kernel-default-livepatch as a component of openSUSE Leap 15.6 kernel-default-livepatch-devel as a component of openSUSE Leap 15.6 kernel-default-optional as a component of openSUSE 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: i40e: remove read access to debugfs files The 'command' and 'netdev_ops' debugfs files are a legacy debugging interface supported by the i40e driver since its early days by commit 02e9c290814c ("i40e: debugfs interface"). Both of these debugfs files provide a read handler which is mostly useless, and which is implemented with questionable logic. They both use a static 256 byte buffer which is initialized to the empty string. In the case of the 'command' file this buffer is literally never used and simply wastes space. In the case of the 'netdev_ops' file, the last command written is saved here. On read, the files contents are presented as the name of the device followed by a colon and then the contents of their respective static buffer. For 'command' this will always be "<device>: ". For 'netdev_ops', this will be "<device>: <last command written>". But note the buffer is shared between all devices operated by this module. At best, it is mostly meaningless information, and at worse it could be accessed simultaneously as there doesn't appear to be any locking mechanism. We have also recently received multiple reports for both read functions about their use of snprintf and potential overflow that could result in reading arbitrary kernel memory. For the 'command' file, this is definitely impossible, since the static buffer is always zero and never written to. For the 'netdev_ops' file, it does appear to be possible, if the user carefully crafts the command input, it will be copied into the buffer, which could be large enough to cause snprintf to truncate, which then causes the copy_to_user to read beyond the length of the buffer allocated by kzalloc. A minimal fix would be to replace snprintf() with scnprintf() which would cap the return to the number of bytes written, preventing an overflow. A more involved fix would be to drop the mostly useless static buffers, saving 512 bytes and modifying the read functions to stop needing those as input. Instead, lets just completely drop the read access to these files. These are debug interfaces exposed as part of debugfs, and I don't believe that dropping read access will break any script, as the provided output is pretty useless. You can find the netdev name through other more standard interfaces, and the 'netdev_ops' interface can easily result in garbage if you issue simultaneous writes to multiple devices at once. In order to properly remove the i40e_dbg_netdev_ops_buf, we need to refactor its write function to avoid using the static buffer. Instead, use the same logic as the i40e_dbg_command_write, with an allocated buffer. Update the code to use this instead of the static buffer, and ensure we free the buffer on exit. This fixes simultaneous writes to 'netdev_ops' on multiple devices, and allows us to remove the now unused static buffer along with removing the read access. CVE-2025-39901 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 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 SP6:kernel-default SUSE Linux Enterprise Live Patching 15 SP6:kernel-default-livepatch SUSE Linux Enterprise Live Patching 15 SP6:kernel-default-livepatch-devel SUSE Linux Enterprise Live Patching 15 SP6:kernel-source SUSE Linux Enterprise Live Patching 15 SP7:kernel-default SUSE Linux Enterprise Live Patching 15 SP7:kernel-default-livepatch SUSE Linux Enterprise Live Patching 15 SP7:kernel-default-livepatch-devel SUSE Linux Enterprise Live Patching 15 SP7:kernel-source SUSE Linux Enterprise Module for Basesystem 15 SP6:kernel-default SUSE Linux Enterprise Module for Basesystem 15 SP6:kernel-default-devel SUSE Linux Enterprise Module for Basesystem 15 SP6:kernel-devel SUSE Linux Enterprise Module for Basesystem 15 SP6:kernel-macros SUSE Linux Enterprise Module for Basesystem 15 SP6:kernel-source SUSE Linux Enterprise Module for Basesystem 15 SP7:kernel-default SUSE Linux Enterprise Module for Basesystem 15 SP7:kernel-default-devel SUSE Linux Enterprise Module for Basesystem 15 SP7:kernel-devel SUSE Linux Enterprise Module for Basesystem 15 SP7:kernel-macros SUSE Linux Enterprise Module for Basesystem 15 SP7:kernel-source SUSE Linux Enterprise Module for Development Tools 15 SP6:kernel-default SUSE Linux Enterprise Module for Development Tools 15 SP6:kernel-source SUSE Linux Enterprise Module for Development Tools 15 SP7:kernel-default SUSE Linux Enterprise Module for Development Tools 15 SP7:kernel-source SUSE Linux Enterprise Module for Legacy 15 SP6:kernel-default SUSE Linux Enterprise Module for Legacy 15 SP6:kernel-source SUSE Linux Enterprise Module for Legacy 15 SP6:reiserfs-kmp-default 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 SP6:kernel-devel-azure SUSE Linux Enterprise Module for Public Cloud 15 SP6:kernel-source-azure 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 12 SP5-LTSS Extended Security:kernel-default SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security:kernel-source SUSE Linux Enterprise Server 12 SP5-LTSS:cluster-md-kmp-default SUSE Linux Enterprise Server 12 SP5-LTSS:dlm-kmp-default SUSE Linux Enterprise Server 12 SP5-LTSS:gfs2-kmp-default SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-default SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-default-base SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-default-devel SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-default-man SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-devel SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-macros SUSE Linux Enterprise Server 12 SP5-LTSS:kernel-source SUSE Linux Enterprise Server 12 SP5-LTSS:ocfs2-kmp-default SUSE Linux Enterprise Server 16.0:kernel-default SUSE Linux Enterprise Server 16.0:kernel-devel SUSE Linux Enterprise Server 16.0:kernel-devel-azure SUSE Linux Enterprise Server 16.0:kernel-macros SUSE Linux Enterprise Server 16.0:kernel-source SUSE Linux Enterprise Server 16.0:kernel-source-azure SUSE Linux Enterprise Server 16.0:kernel-source-vanilla SUSE Linux Enterprise Server Teradata 12 SP3:kernel-default SUSE Linux Enterprise Server Teradata 12 SP3:kernel-source SUSE Linux Enterprise Workstation Extension 15 SP6:kernel-default SUSE Linux Enterprise Workstation Extension 15 SP6:kernel-default-extra SUSE Linux Enterprise Workstation Extension 15 SP6:kernel-source 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 SP6:kernel-devel-rt SUSE Real Time Module 15 SP6: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 moderate 5.1 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H