SB20260529176 - Use-after-free in Linux kernel xfrm
Published: May 29, 2026
Security Bulletin ID
SB20260529176
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) Use-after-free (CVE-ID: CVE-2026-46116)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in __xfrm_state_delete when deleting xfrm_state list entries during xfrm_state lifecycle handling. A local user can trigger repeated deletion of the same xfrm_state object to cause a denial of service.
The issue was reproduced under syzkaller load during network namespace cleanup in the xfrm subsystem.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/14acf9652e5690de3c7486c6db5fb8dafd0a32a3
- https://git.kernel.org/stable/c/26edb0a3c99f9d958c212be68b21f1221614dcf0
- https://git.kernel.org/stable/c/4980162de555cb838f1a189ce7d2cbf5d2e7b050
- https://git.kernel.org/stable/c/a2e2d08fb070fab4947447171f1c4e3ca5a188e5
- https://git.kernel.org/stable/c/b4a53add2fa8f1b5aa17d4c5686c320785fab182