Use-after-free in Linux kernel - CVE-2026-89709
Published: September 12, 2026
Vulnerability identifier: #VU149092
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89709
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89709
Install security update from vendor's repository.