CVE-2026-43107

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43 ↗

Additional information

• NVD record
• 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
• https://git.kernel.org/stable/c/b7dbdc34d22f743abb2c460dfae0d69cd8a45e69
• https://git.kernel.org/stable/c/f8f3bb89ab677db15f9f5250c77af728f9afe995