SB2026091240 - Use-after-free in Linux kernel typec altmodes driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-89737)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

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

The vulnerability exists due to failure to synchronize work item teardown in tbt_altmode_remove() in the Thunderbolt Type-C alternate mode driver when removing a Thunderbolt alternate mode while tbt->work is pending. A local user can trigger alternate mode removal while the pending work item can dereference dropped plug and cable references to cause a use-after-free condition.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0a25484fe22f621e151367a59a82330a22ac80bc
• https://git.kernel.org/stable/c/92090f6ff2acc81e9dd99881dcfb4f8c1bdaabd3
• https://git.kernel.org/stable/c/ebb840d982a612261cfc8a7687735a140c6c7024