Hacking your PC using your speaker without ever touching it

In my last post, I talked about reverse engineering my new Creative Sound Blaster Katana V2X's firmware.

What initially started as simply wanting to write a Linux tool for communicating with my speaker ended up with me discovering vulnerabilities which allow any attacker within a ~15M range of any Katana V2X to turn it into a covert spying tool and Rubber Ducky - all without ever having to pair with or physically touch the device.