SB20260912303 - Deadlock in Linux kernel ocfs2 cluster
Published: September 12, 2026
Security Bulletin ID
SB20260912303
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) Deadlock (CVE-ID: CVE-2026-89491)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a lock order inversion in o2hb_region_pin() when it is invoked from the configfs drop_item callback. A local user can trigger heartbeat-region removal processing to cause a denial of service.
Remediation
Install update from vendor's website.