SB20260812340 - Use-after-free in Linux kernel core

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-68200)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [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]

The vulnerability allows a local user to cause a use-after-free.

The vulnerability exists due to use-after-free in ALSA timer callback handling in sound/core/timer.c when triggering the same userspace-driven timer concurrently through the TRIGGER ioctl. A local user can issue concurrent timer trigger operations to cause a use-after-free.

The issue is reachable by any user able to open /dev/snd/timer, including through a user timer instance and through a sequencer queue timer bound to the userspace-driven timer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1395327a96614885552bae5fbb650e6dd182d49b
• https://git.kernel.org/stable/c/70d28bfcd6224eed75986b3b987b997e59643fa4
• https://git.kernel.org/stable/c/996c24377eea4d4506b7c3ccbbf1e490440b5e0b
• https://git.kernel.org/stable/c/c1078130a4cd7e738f4b73afe99b3e68cbfbf884