Use-after-free in Linux kernel - CVE-2026-72463
Published: August 15, 2026
Vulnerability identifier: #VU142974
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-72463
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-72463
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3