SB20261022294 - Use-after-free in Linux kernel thunderbolt driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98693)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows an attacker with physical access to system to trigger access to freed kernel memory, potentially causing a denial of service.

The vulnerability exists due to use-after-free in the Linux kernel Thunderbolt driver when removing a router while DisplayPort tunnel work remains pending. An attacker with physical access to system can disconnect a cable while a tunnel is waiting for a DPRX capabilities read to finish, causing subsequent HopID releases in tb_path_free() to access freed ID allocators and potentially disrupt kernel operation.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/032c59c7681c661b63123231824170c025afb7e7
• https://git.kernel.org/stable/c/2b5f976119d8f099a03cbf700df3d9c8690fe33d
• https://git.kernel.org/stable/c/c444d2c17dc236680324fd989232199680a6c419