Race condition in Linux kernel - CVE-2026-80666
Published: August 28, 2026
Vulnerability identifier: #VU146142
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-80666
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-80666
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3