Kernel security, year to date

Actually, some systems (even Linux systems) have in the past used the random number sources on sound cards as a source of randomness (not terribly good sources, there's all sorts of rhythmic electrical noise in there, but still they're sources). If that's a system's only source of entropy, and an attacker makes the sound card stop working, you've now got an entropyless system. A good few things will stall forever in such circumstances -> DoS.

(Sure, it's contrived: perhaps the only thing that saves us is that the contrived part is the original setup of the system, which isn't something an attacker can easily contrapt.)