SB20261023200 - Use-after-free in Linux kernel cgroup
Published: October 23, 2026
Security Bulletin ID
SB20261023200
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-2026-98972)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to potentially cause a denial of service by crashing the kernel.
The vulnerability exists due to use-after-free in the Linux kernel cpuset is_in_v2_mode() helper when a cgroup filesystem is being rebound. A local privileged user can potentially trigger dereferencing of a stale cpuset_cgrp_subsys.root pointer during rebinding to cause a kernel crash.
Remediation
Install update from vendor's website.