Use-after-free in Linux kernel - CVE-2026-89736
Published: September 12, 2026
Vulnerability identifier: #VU149062
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89736
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to use-after-free in the USB gadget u_audio sound card cleanup handling when accessing or closing open ALSA control file descriptors after sound card teardown is initiated. A local user can access or close open ALSA control file descriptors to cause memory corruption.
ALSA control callbacks can dereference private data associated with a freed sound card context.
Affected software
Linux kernel
How to mitigate CVE-2026-89736
Install security update from vendor's repository.