SB2026092888 - Race condition in Linux kernel bluetooth

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-98109)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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 trigger a kernel DEBUG_LOCKS warning.

The vulnerability exists due to a race condition in Bluetooth HCI device registration and Microsoft extension initialization when registering a Bluetooth device marked with an unconfigured-device quirk. A local user can trigger concurrent power-on work processing before the Microsoft extension mutex is initialized to trigger a kernel DEBUG_LOCKS warning.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18
• https://git.kernel.org/stable/c/a11ebe8dc0333fb870bbbb656b34690e87ee3f98
• https://git.kernel.org/stable/c/b1faf348c29e6f8302ec7769cbf1c1ef05be014f
• https://git.kernel.org/stable/c/d427b1c71d9798083e954d3c13469dc0a2305868