SB20260626157 - Use-after-free in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-53193)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/586b219a22b1032b28b8bd356b963276c5e5bf53
• https://git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f
• https://git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92
• https://git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92