Russian anti-virus company Doctor Web discovered a cross-platform backdoor that runs under Mac OS X and Linux. That Mac OS X is not immune from malware may surprise some, but really that is old news. One attacking Linux too, well that is more surprising.
This malicious program, BackDoor.Wirenet.1, is designed to steal passwords stored by a number of popular applications and also operates as a keylogger (it sends gathered keyboard input data to intruders). It's not clear how BackDoor.Wirenet.1, spreads.
Looks like it might be time to get some anti-malware protection for your Linux box, or for you Mac, if you haven't already.