CVE-2022-20566

A use-after-free flaw was found in the Linux kernel's Bluetooth functionality. A user could trigger a race condition while closing the connection. This issue may allow a local user to crash or potentially escalate their privileges on the system.

For RHEL 9, the issue is already fixed. Overall, this issue is considered Moderate because the race condition is complex and can only be triggered by a local user while closing the connection.

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.

The only way to mitigate these vulnerabilities on the operating system level is to disable the Bluetooth functionality via blacklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. How to disable Bluetooth modules instructions are available on the Customer Portal at https://access.redhat.com/solutions/2682931.

Alternatively, Bluetooth can be disabled within the hardware or at BIOS level, which will also provide an effective mitigation as the kernel will not be able to detect that Bluetooth hardware is present on the system.