SB20260918372 - Use-after-free in Linux kernel ocfs2 cluster
Published: September 18, 2026
Security Bulletin ID
SB20260918372
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-2026-90302)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the OCFS2 o2net heartbeat callback handling when local-node teardown overlaps heartbeat node-down callback processing. A local user can initiate local-node teardown during heartbeat callback processing to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/073f51e39bed354452a057d38a4cc3952727c304
- https://git.kernel.org/stable/c/3e326f3bf16506873777444608e8b715aab74a7a
- https://git.kernel.org/stable/c/7601db4c9d3bd9ab2482a863cb05204154d51ae8
- https://git.kernel.org/stable/c/8f96b78314cff0778a3466e49e5edbc1e459c95c
- https://git.kernel.org/stable/c/a03078a9a2a1c5e4a62f65d389c1f75f9898e21d
- https://git.kernel.org/stable/c/aee687a2fb36974dc37e4e0f5b03802067c6c4ec
- https://git.kernel.org/stable/c/cbb4efc2f99d6a8dba09c96b10acad82da982cf9
- https://git.kernel.org/stable/c/fb61882e184ee5ca745806bc5b2a8483fa129bca