Use-after-free in Linux kernel - CVE-2026-53116
Published: June 25, 2026
Vulnerability identifier: #VU135196
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53116
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the AP bus driver_override handling in drivers/s390/crypto/ap_bus.c and drivers/s390/crypto/ap_queue.c when updating AP masks concurrently with driver_override sysfs operations. A local user can trigger concurrent driver_override changes and AP mask updates to cause a denial of service.
Exploitation requires access to local sysfs interfaces that modify AP mask or driver override settings.
How to mitigate CVE-2026-53116
Install security update from vendor's repository.