CVE-2024-26886

A flaw was found in the Linux kernel’s Bluetooth subsystem, specifically within the af_bluetooth module. The issue arises when attempting to perform a sock_lock on the .recvmsg method, leading to a deadlock situation. In this scenario, multiple tasks wait indefinitely for a resource, causing significant performance degradation or system crashes. The vulnerability occurs during Bluetooth operations, where tasks are blocked for more than 30 seconds, creating potential instability. The solution was to replace the sock_sock lock with the sk_receive_queue.lock in the bt_sock_ioctl function to prevent a use-after-free (UAF) condition and avoid the deadlock.

This flaw has been rated as having a Moderate impact because it is believed to be difficult to exploit and cannot be used to achieve local privilege escalation.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.