SB20260828117 - Race condition in Linux kernel bluetooth

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-80666)

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

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in sco_sock_timeout() and SCO socket handling in net/bluetooth/sco.c when closing a socket while asynchronous timeout work is running. A local user can trigger socket close operations during concurrent timeout processing to cause a denial of service.

The issue can lead to a deadlock because the same socket lock may be acquired twice during the close path and timeout work interaction.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0f8a5dcc66648b6e1458a9f3ba4c5a0463a228fc
• https://git.kernel.org/stable/c/a50da115b5888062d32c86a548a29b4e2559d7ec
• https://git.kernel.org/stable/c/da4d8eea0c5f33ea35c0e1d9e5f3e439f3b987ce