CVE-2025-40363
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…
Does this matter?
Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published.
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.
- CVSS
- Not yet scored
- EPSS
- 0.21% probability · 11th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS 0.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://git.kernel.org/stable/c/0bf756ae1e69fec5e6332c37830488315d6d771b
- https://git.kernel.org/stable/c/2327a3d6f65ce2fe2634546dde4a25ef52296fec
- https://git.kernel.org/stable/c/2da805a61ef5272a2773775ce14c3650adb84248
- https://git.kernel.org/stable/c/75b16b2755e12999ad850756ddfb88ad4bfc7186
- https://git.kernel.org/stable/c/9bf27de51bd6db5ff827780ec0eba55de230ba45
- https://git.kernel.org/stable/c/b056f971bd72b373b7ae2025a8f3bd18f69653d3
- https://git.kernel.org/stable/c/c14cf41094136691c92ef756872570645d61f4a1
- https://git.kernel.org/stable/c/f28dde240160f3c48a50d641d210ed6a3b9596ed
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.