As the article states "These undocumented HCI commands cannot be triggered by Bluetooth, radio signals, or over the Internet, unless there is a vulnerability in the application itself or the radio protocols.". Hence I dont think there is any security risk here assuming the application and radio is safe.
It differs in a way that the person must have access to the device to flash firmware I believe. In x86 as you describe, the person could attack with a connection to the device/machine.
It differs in a way that the person must have access to the device to flash firmware I believe. In x86 as you describe, the person could attack with a connection to the device/machine.