Use-after-free in Linux kernel - CVE-2026-53193
Published: June 26, 2026
Vulnerability identifier: #VU135599
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-2026-53193
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 or potentially execute arbitrary code.
The vulnerability exists due to a use-after-free in the ALSA timer subsystem when closing and freeing timer objects that still have pending timer instances, including slave instances associated with a master instance. A local user can open and close a userspace-driven timer while other applications continue accessing the timer to cause a denial of service or potentially execute arbitrary code.
The issue can be triggered particularly when userspace-driven timers are enabled with CONFIG_SND_UTIMER.
How to mitigate CVE-2026-53193
Install security update from vendor's repository.