SB20260928238 - Improper locking in Linux kernel legitimize_ns() in kernel/nstree.c
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928238
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-97971)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to improper reference count handling in legitimize_ns() in kernel/nstree.c when processing namespace listing requests. A local user can invoke listns for a namespace they are not permitted to list to compromise confidentiality, integrity, and availability.
Remediation
Install update from vendor's website.