CVE-2026-77684 Bluetooth Classic HFP Hands-Free: TX buffer leak on RFCOMM disconnect leads to permanent Bluetooth denial of service

The Bluetooth Classic Hands-Free Profile HF role in subsys/bluetooth/host/classic/hfphf.c does not release the AT command buffers that are still queued on hf-txpending when the RFCOMM DLC goes down. hfphfdisconnected only cancelled the work items and cleared hf-acl, and no other code path ever...