SB2026050886 - Race condition in Linux kernel cgroup

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Main Vulnerability Database SB2026050886

SB2026050886 - Race condition in Linux kernel cgroup

Published: May 8, 2026

Security Bulletin ID SB2026050886
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) Race condition (CVE-ID: CVE-2026-43439)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 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/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in css_task_iter handling in the cgroup task iteration logic when iterating tasks concurrently with task migration between css_set lists. A local user can trigger task migration while cgroup.procs is being read to cause a denial of service.

Successful exploitation requires a very small race window between task migration and iteration, and may lead to crashes or infinite loops.


Remediation

Install update from vendor's website.

References