Malware certainly exists for Linux, but it's more frequently targeted at servers than everyday PCs. Unfortunately, regular users now have more reason to worry: a rare instance of a Linux desktop trojan, Hand of Thief, has surfaced in the wild. The code swipes banking logins and other web sign-in details, creates a backdoor and prevents access to both antivirus tools and virtual machines. It's known to work with common browsers like Chrome and Firefox as well as 15 Linux distributions, including Debian, Fedora and Ubuntu. Thankfully, Hand of Thief is partly neutered by its limited attack methods; it relies on social engineering to fool victims into installing the software themselves. Even so, the trojan is a reminder that we shouldn't be complacent about security, regardless of which platform we use.
Red Hat Fedora 18
Canonical Ubuntu 14.04