SB20260507271 - Use-after-free in Linux kernel xfrm

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Main Vulnerability Database SB20260507271

SB20260507271 - Use-after-free in Linux kernel xfrm

Published: May 7, 2026

Security Bulletin ID SB20260507271
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-43091)

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 policy_bydst hash tables during network namespace teardown when concurrent RCU-protected policy lookups are performed. A local user can trigger network namespace teardown while the tables are still being accessed to cause a denial of service.

The issue occurs because the memory can be freed before an RCU grace period has elapsed.


Remediation

Install update from vendor's website.

References