Indeed! An intelligent "USB Device" is what was used to originally jailbreak the PS3. [0] A USB device (commonly using an AVR USB microcontroller) sends differing USB descriptors at different times - a sort of double-fetch vulnerability. The exploit leads to complete hypervisor access. Do NOT trust your USB device!
[0]: http://ps3wiki.lan.st/index.php?title=PSJailbreak_Exploit_Re...