SB20260406120 - Race condition in Linux kernel xfrm
Published: April 6, 2026
Security Bulletin ID
SB20260406120
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Race condition (CVE-ID: CVE-2026-31406)
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 update from vendor's website.