SB2026091269 - Use-after-free in Linux kernel linux lockd
Published: September 12, 2026
Security Bulletin ID
SB2026091269
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-2026-89709)
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 cause a denial of service.
The vulnerability exists due to a use-after-free in the nlmsvc_ops dispatch path in fs/lockd/svcsubs.c when lockd dispatches callbacks while the nfsd module is being unloaded. A local privileged user can trigger lockd dispatch during nfsd module shutdown to cause a denial of service.
Remediation
Install update from vendor's website.