CVE-2026-43107

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.

The following products are affected by CVE-2026-43107 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-43107.

URL	Resource
https://git.kernel.org/stable/c/2c41283d94af943a05f7f2cc1a01f0c872f3cf43
https://git.kernel.org/stable/c/58e5735d1a5373652f405a0c16e54ac04aaab0ad
https://git.kernel.org/stable/c/7081d46d32312f1a31f0e0e99c6835a394037599
https://git.kernel.org/stable/c/e62e322ea20be78e346e4b49f9a6b9f03313af4c
https://lore.kernel.org/linux-cve-announce/2026050623-CVE-2026-43107-dc43@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-43107
https://www.cve.org/CVERecord?id=CVE-2026-43107