SB20260815255 - Use-after-free in Linux kernel xfrm

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72463)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a use-after-free in the xfrm async resumption handling in net/xfrm/xfrm_input.c when processing xfrm packets and resuming transport processing asynchronously. A remote attacker can send crafted traffic that triggers xfrm_rcv_cb to modify skb->dev and cause a denial of service.

The issue involves a race condition with tunnel device teardown and affects handling of both IPv4 and IPv6 transport finish paths.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/63a30015199912bd5055bead8001b1ae68a67cdb
• https://git.kernel.org/stable/c/8045c0df98d4f14c54e5cb875f1c9c0ce89fe4ff