SB20260720332 - Use-after-free in Linux kernel xfrm

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-63911)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in the iptfs state cloning logic in net/xfrm/xfrm_iptfs.c when destroying a cloned security association after a failed state migration. A local user can trigger state migration failure and queued packet handling to cause a denial of service.

The issue can involve shared cloned runtime objects, including queue, timer, lock, and reassembly or reorder state copied from the original security association.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7f83d174073234839aea176f265e517e0d50a1d2
• https://git.kernel.org/stable/c/9327252e04626d4bb02ca8c0c108fbe8eabf0c5a
• https://git.kernel.org/stable/c/dfb9f6cbfa9826655a49698cf90eb800fce2178e