SB2026091239 - Use-after-free in Linux kernel gadget function driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-89736)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1
• https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27
• https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b
• https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47