Use-after-free in Linux kernel - CVE-2026-89660
Published: September 12, 2026
Vulnerability identifier: #VU149142
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89660
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to trigger a use-after-free condition.
The vulnerability exists due to a race condition in nfsd4_revoke_states() when revoking NFS stateids concurrently with client teardown. A local privileged user can cause client teardown to race with state revocation to trigger a use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-89660
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3