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

Bluetooth: bnep: pin L2CAP connection during netdev registration

bnep_add_connection() reads the L2CAP connection without holding the
channel lock, then passes its HCI device to register_netdev(). Controller
teardown can clear and release that connection concurrently, leaving the
network device registration path to dereference a freed parent device.

Take a reference to the L2CAP connection while holding the channel lock.
Retain it until register_netdev() has taken the parent device reference.

https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944

https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302

https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc

https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da

https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19

https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31

https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5

https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee

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