Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain `skb_put()`: - `SADB_ACQUIRE` - `SADB_X_NAT_T_NEW_MAPPING` - `SADB_X_MIGRATE` Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.12.1, < 6.12.88 |
References
- https://git.kernel.org/stable/c/11cbf294bac623bd57296f231199193087f57b4aPatch
- https://git.kernel.org/stable/c/2e74f974359b5382ecbe8536abbb5b837eb6c724Patch
- https://git.kernel.org/stable/c/3c19cb8a84ef709d57943bd6664cf31cb91ba6ec
- https://git.kernel.org/stable/c/426c355742f02cf743b347d9d7dbdc1bfbfa31efPatch
- https://git.kernel.org/stable/c/edd446ee7cd3d02cac246168063d5b3e9ea68460Patch
FAQ
What is CVE-2026-43088?
CVE-2026-43088 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr ...
How severe is CVE-2026-43088?
CVE-2026-43088 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43088?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.