Use-after-free in Linux kernel - CVE-2026-90036
Published: September 16, 2026
Vulnerability identifier: #VU150256
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90036
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger a use-after-free condition.
The vulnerability exists due to use-after-free in the NFSD blocked-lock reaping logic when reaping blocked locks concurrently with client expiration. A remote attacker can cause a client to be freed before nfs4_put_stateowner() dereferences its cl_lock to trigger a use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-90036
Install security update from vendor's repository.