In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HCI: Remove HCI_AMP support Since BT_HS has been remove HCI_AMP controllers no longer has any use so remove it along with the capability of creating AMP controllers. Since we no longer need to differentiate between AMP and Primary controllers, as only HCI_PRIMARY is left, this also remove hdev->dev_type altogether.
https://git.kernel.org/stable/c/d3c7b012d912b31ad23b9349c0e499d6dddd48ec
https://git.kernel.org/stable/c/af1d425b6dc67cd67809f835dd7afb6be4d43e03
https://git.kernel.org/stable/c/84a4bb6548a29326564f0e659fb8064503ecc1c7
https://git.kernel.org/stable/c/5af2e235b0d5b797e9531a00c50058319130e156