SB20261022367 - Use of Uninitialized Variable in Linux kernel typec tipd driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-98759)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows an attacker with physical access to system to expose kernel stack data and potentially cause a denial of service.

The vulnerability exists due to use of an uninitialized stack variable in cd321x_update_work() in the USB Type-C tipd driver when registering a USB Type-C partner. An attacker with physical access to system can connect a USB device to an affected port to trigger device linking that may invoke uninitialized callback pointers, potentially crashing the kernel; uninitialized descriptor fields also expose kernel stack data through partner sysfs.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5414144e202a32437e3eb436cd3f5f00d79ad86e
• https://git.kernel.org/stable/c/75dc6cb377efd2f4428b7f76d3a590a0bbc10399
• https://git.kernel.org/stable/c/88c7e458af53ff781a3f1051708395892b325576