Hm... interesting. For anybody who doesn't make computers their hobby, this requires that someone either have access to your machine locally or that they load a virus on to it remotely or something like that -- if they can't execute anything on your computer, then they can't use this attack to steal your private keys :)If you use Tails or some other live CD that you can't really update, I wouldn't worry about it. Don't get me wrong, it is a risk, but I wouldn't switch operating systems because of it or anything.