Use-after-free in Linux kernel - CVE-2026-90156
Published: September 19, 2026
Vulnerability identifier: #VU151331
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90156
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 denial of service.
The vulnerability exists due to use-after-free in the ksmbd smb2_lock function when processing deferred SMB lock requests during asynchronous setup failures. A remote attacker can send SMB lock requests that result in deferred locks to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90156
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3