#VU124960 Race condition in Linux kernel - CVE-2026-31406
Published: April 6, 2026
Vulnerability identifier: #VU124960
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-31406
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in xfrm_nat_keepalive_net_fini() and nat_keepalive_work when cleaning up network namespaces. A local user can trigger network namespace cleanup to cause a denial of service.
The issue occurs because delayed work may be re-scheduled after cancellation and then execute on a freed net structure.
Remediation
Install security update from vendor's repository.