[daveguy]

I had a linux system hit with a virus early 2000s. I had more confidence than linux skills back then and made some colossal blunders to make it happen. But whatever you use as your daily machine, it isn't immune. It's a smaller target, but there is still malware out there for Linux. One of the first widespread computer worms was Unix based[1].

[1] https://en.wikipedia.org/wiki/Morris_worm

PS Edit: Many routers are linux/unix based so it is a much bigger target than a lot of people on this thread are making out. If you have control of a company's routers you are in position to do a lot of damage.