Use-after-free in Linux kernel - CVE-2026-90162
Published: September 19, 2026
Vulnerability identifier: #VU151321
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90162
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a use-after-free and double-free.
The vulnerability exists due to improper synchronization in smb2_lock() when processing SMB2_LOCK request arrays. A remote attacker can submit a crafted SMB2_LOCK request with a later failing lock element while concurrently sending an UNLOCK request to cause a use-after-free and double-free.
The concurrent UNLOCK request must target the same connection before rollback processing occurs.
Affected software
Linux kernel
How to mitigate CVE-2026-90162
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3