Unrated severityNVD Advisory· Published Dec 16, 2025· Updated Apr 15, 2026
CVE-2025-40363
CVE-2025-40363
Description
In the Linux kernel, the following vulnerability has been resolved:
net: ipv6: fix field-spanning memcpy warning in AH output
Fix field-spanning memcpy warnings in ah6_output() and ah6_output_done() where extension headers are copied to/from IPv6 address fields, triggering fortify-string warnings about writes beyond the 16-byte address fields.
memcpy: detected field-spanning write (size 40) of single field "&top_iph->saddr" at net/ipv6/ah6.c:439 (size 16) WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439
The warnings are false positives as the extension headers are intentionally placed after the IPv6 header in memory. Fix by properly copying addresses and extension headers separately, and introduce helper functions to avoid code duplication.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
83- osv-coords81 versionspkg:linux/kernelpkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2016.0pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2016.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-livepatch-SLE15-SP7-RT_Update_9&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-livepatch-SLE15-SP7_Update_9&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-obs-qa&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-obs-qa&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.2pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.1pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_77&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5
>= 2.6.12, < 5.4.302+ 80 more
- (no CPE)range: >= 2.6.12, < 5.4.302
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1.160000.2.7
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-150700.20.27.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-150700.53.31.1.150700.17.21.1
- (no CPE)range: < 6.12.0-160000.26.1.160000.2.7
- (no CPE)range: < 6.12.0-160000.26.1.160000.2.7
- (no CPE)range: < 6.4.0-39.1.21.16
- (no CPE)range: < 6.4.0-39.1.21.16
- (no CPE)range: < 6.12.0-160000.26.1.160000.2.7
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.4.0-39.1
- (no CPE)range: < 6.4.0-39.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-39.1
- (no CPE)range: < 6.4.0-39.1
- (no CPE)range: < 1-150700.1.3.2
- (no CPE)range: < 1-150700.15.3.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-150700.7.31.2
- (no CPE)range: < 6.4.0-150700.20.27.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.4.0-39.1
- (no CPE)range: < 6.4.0-39.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-40.1
- (no CPE)range: < 6.4.0-150700.7.31.1
- (no CPE)range: < 6.4.0-150700.20.27.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 4.12.14-122.293.1
- (no CPE)range: < 6.4.0-150700.7.31.1
- (no CPE)range: < 6.4.0-150700.53.31.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 6.12.0-160000.26.1
- (no CPE)range: < 1-8.3.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/0bf756ae1e69fec5e6332c37830488315d6d771bnvd
- git.kernel.org/stable/c/2327a3d6f65ce2fe2634546dde4a25ef52296fecnvd
- git.kernel.org/stable/c/2da805a61ef5272a2773775ce14c3650adb84248nvd
- git.kernel.org/stable/c/75b16b2755e12999ad850756ddfb88ad4bfc7186nvd
- git.kernel.org/stable/c/9bf27de51bd6db5ff827780ec0eba55de230ba45nvd
- git.kernel.org/stable/c/b056f971bd72b373b7ae2025a8f3bd18f69653d3nvd
- git.kernel.org/stable/c/c14cf41094136691c92ef756872570645d61f4a1nvd
- git.kernel.org/stable/c/f28dde240160f3c48a50d641d210ed6a3b9596ednvd
News mentions
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