Your alarmist Uncle Jack has been negligent. It seems any of us who use Flash, regardless of underlying platform (here that Mac folks?) are in danger here. For now, the only thing I can think of to do is disable Flash.
There will doubtless be more details in the next few days. Expect protection from AV companies and workarounds from Adobe, if not an actual fix. (Everyone in the know seems to be betting on a combination of both, as the problem lies in something Adobe can't control; the tools used to build Flash sites.) Isn't the Internet grand?