SB20260720399 - Race condition in Linux kernel bluetooth

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-63871)

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 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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020
• https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348
• https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f
• https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e