In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: serialize accept_q access

bt_sock_poll() walks the accept queue without synchronization, while
child teardown can unlink the same socket and drop its last reference.
The unsynchronized accept queue walk has existed since the initial
Bluetooth import.

Protect accept_q with a dedicated lock for queue updates and polling.
Also rework bt_accept_dequeue() to take temporary child references under
the queue lock before dropping it and locking the child socket.

https://git.kernel.org/stable/c/41c8c1c7923e86e0eb59cfb4279349112756a336

https://git.kernel.org/stable/c/4ec17782fd186f901a7329605d11048b085b945a

https://git.kernel.org/stable/c/85f8674cae82053f1e6bab295f6a8422cca14db5

https://git.kernel.org/stable/c/8b4c412e001b0c670eb937beab491af974da55b3

https://git.kernel.org/stable/c/a218bf69eb51fefe59a3976fa8925261141f681c

https://git.kernel.org/stable/c/be43e6b4043113c3b3cf887c3c8350f67140274c

https://git.kernel.org/stable/c/d9ce4de05df2385c19e2c7d12f529144e1a44af1

https://git.kernel.org/stable/c/e83f5e24da741fa9405aeeff00b08c5ee7c37b88

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