CVE-2025-40363

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Source
https://cve.org/CVERecord?id=CVE-2025-40363
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40363.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-40363
Downstream
Related
Published
2025-12-16T13:40:03.265Z
Modified
2026-03-20T12:43:16.796192Z
Summary
net: ipv6: fix field-spanning memcpy warning in AH output
Details

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 ah6output() and ah6output_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 "&topiph->saddr" at net/ipv6/ah6.c:439 (size 16) WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6output+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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40363.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed
2da805a61ef5272a2773775ce14c3650adb84248
Fixed
9bf27de51bd6db5ff827780ec0eba55de230ba45
Fixed
0bf756ae1e69fec5e6332c37830488315d6d771b
Fixed
75b16b2755e12999ad850756ddfb88ad4bfc7186
Fixed
f28dde240160f3c48a50d641d210ed6a3b9596ed
Fixed
c14cf41094136691c92ef756872570645d61f4a1
Fixed
b056f971bd72b373b7ae2025a8f3bd18f69653d3
Fixed
2327a3d6f65ce2fe2634546dde4a25ef52296fec

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40363.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.6.12
Fixed
5.4.302
Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.10.247
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.197
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.159
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.117
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.58
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.17.8

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40363.json"