CVE-2025-40363 | BDVDB-2026-306146 Detail
LinuxLinux
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.
Impact#
No impact statement in the source data.
Weaknesses#
No weakness recorded in the source data.
References#
- https://git.kernel.org/stable/c/2da805a61ef5272a2773775ce14c3650adb84248
- https://git.kernel.org/stable/c/9bf27de51bd6db5ff827780ec0eba55de230ba45
- https://git.kernel.org/stable/c/0bf756ae1e69fec5e6332c37830488315d6d771b
- https://git.kernel.org/stable/c/75b16b2755e12999ad850756ddfb88ad4bfc7186
- https://git.kernel.org/stable/c/f28dde240160f3c48a50d641d210ed6a3b9596ed
- https://git.kernel.org/stable/c/c14cf41094136691c92ef756872570645d61f4a1
- https://git.kernel.org/stable/c/b056f971bd72b373b7ae2025a8f3bd18f69653d3
- https://git.kernel.org/stable/c/2327a3d6f65ce2fe2634546dde4a25ef52296fec
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.