SB2026090599 - Deadlock in Linux kernel xfrm
Published: September 5, 2026
Security Bulletin ID
SB2026090599
CSH 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 vulnerability.
1) Deadlock (CVE-ID: CVE-2026-80845)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 improper lock ordering in the xfrm NAT keepalive worker when NAT keepalive processing races with security association deletion. A local user can trigger concurrent NAT keepalive processing and security association deletion to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/5c86c895d1cac81a71ead3005084c6265cf6a7a5
- https://git.kernel.org/stable/c/763fe700b7c58ad64fe5202c5638848244dd4127
- https://git.kernel.org/stable/c/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d
- https://git.kernel.org/stable/c/a9fa05b7a1246797748d15771052639e0d3cabf1
- https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e