Improper locking in Linux kernel - CVE-2026-89956
Published: September 17, 2026
Vulnerability identifier: #VU150338
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89956
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause kernel memory corruption or a use-after-free condition.
The vulnerability exists due to improper locking in the s390 VFIO AP mediated-device list handling when concurrently creating, removing, or looking up mediated devices. A local user can concurrently manipulate mediated devices to cause kernel memory corruption or a use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-89956
Install security update from vendor's repository.