In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that.
https://git.kernel.org/stable/c/f0a544ef6e38e4063d0ed72ad83d6bf0f4e70805
https://git.kernel.org/stable/c/a4de6fc95b2f36967fc247ae51cad2171194f7cd
https://git.kernel.org/stable/c/9a77f296aff4b2ca5f2928ab3a3220c82d8b4074
https://git.kernel.org/stable/c/301a4e2e89313dee10f0e8cb084daedbbe4a3dce
https://git.kernel.org/stable/c/2f5d635ad5906b0235bc0c870e8beba3116e1e98