SB20261022292 - Improper update of reference count in Linux kernel thunderbolt driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper update of reference count (CVE-ID: CVE-2026-98692)

CWE-ID: CWE-911 - Improper Update of Reference Count

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to consume kernel resources and potentially cause a denial of service.

The vulnerability exists due to improper reference counting in the Linux kernel Thunderbolt DisplayPort tunnel handling when reactivating discovered tunnels without an activation callback during hibernation restore. A local user can trigger the affected tunnel activation path to leave tunnel references unreleased, potentially exhausting kernel resources and causing a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/12f5d8b85a66a0ac08d082517d92ce136f8c0d42
• https://git.kernel.org/stable/c/47d60ea801fc333a10c576691eca2e7840b02d3d