The stock OS on a PS3 will not allow you to run any unapproved software. of course it can be hacked, anything can be hacked. But so long as you only use approved software and games, you will never get a virus. I have three PS3's and have hacked them all using linux so i can play games for free. I even wrote a hack so I didn't have to update my system OS to play new games. I know how the OS works, how to hack it, how to destroy it and how to write a virus for it if I wanted. BUT I would never be able to run the virus on a system that hasn't already been hacked.