CVE-2026-74510Bluetooth: mgmt: fix UAF in pair command cancellation

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: mgmt: fix UAF in pair command cancellation The pairing completion and authentication failure callbacks look up the pending MGMT_OP_PAIR_DEVICE command by walking hdev->mgmt_pending. The lookup returned a command that was still linked on the shared pending list, without keeping mgmt_pending_lock held for the later dereference and removal. A concurrent MGMT_OP_CANCEL_PAIR_DEVICE request can remove and free the same pending command before the callback uses it. The reverse race is also possible when cancel_pair_device() gets a command from pending_find() and a callback removes it before the cancel path dereferences it. This can lead to a use-after-free and a second list_del(). Make the pairing lookup helpers transfer ownership of the pending command by removing it from hdev->mgmt_pending while holding mgmt_pending_lock. The callbacks and cancel path then complete the command and free it directly, so racing paths cannot find or free the same command again. Take a temporary hci_conn reference in cancel_pair_device() because the command completion drops the reference stored in the pending command.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/50af4280a587c9971b5388cbc438f1324e626b7b
• https://git.kernel.org/stable/c/86ed4dd6548ccf277bc691bc912ca06e76b9d80c
• https://git.kernel.org/stable/c/7c2a152a897cd1c184b2051484d4f74d803e7f4a
• https://git.kernel.org/stable/c/c569def320aa8b1fde89227e2ea96606790fd86d
• https://git.kernel.org/stable/c/51be7280980fddc90ebe874a69c2fe8ab02bb46a
• https://git.kernel.org/stable/c/d0a7b48ad0921bd88effaee10bf970ab1d5d0ddd