Race condition in Linux kernel - CVE-2026-63871
Published: July 20, 2026
Vulnerability identifier: #VU138780
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-2026-63871
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 Bluetooth ISO socket handling in net/bluetooth/iso.c when calling hci_get_route() on iso_pi socket fields without holding the socket lock. A local user can trigger concurrent connect() or setsockopt() operations on the same socket to cause a denial of service.
The issue was reported by KCSAN as a data race during Bluetooth ISO connection and listening operations.
Affected software
Linux kernel
How to mitigate CVE-2026-63871
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3