Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_aevent() appends attributes including XFRMA_IF_ID when x->if_id is set. xfrm_aevent_msgsize() does not include space for XFRMA_IF_ID. For states with if_id, build_aevent() can fail with -EMSGSIZE and hit BUG_ON(err < 0) in xfrm_get_ae(), turning a malformed netlink interaction into a kernel panic. Account XFRMA_IF_ID in the size calculation unconditionally and replace the BUG_ON with normal error unwinding.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.19, < 6.12.83 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43Patch
- https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0adPatch
- https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599Patch
- https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4cPatch
FAQ
What is CVE-2026-43107?
CVE-2026-43107 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: xfrm: account XFRMA_IF_ID in aevent size calculation xfrm_get_ae() allocates the reply skb with xfrm_aevent_msgsize(), then build_...
How severe is CVE-2026-43107?
CVE-2026-43107 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-2026-43107?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.