Guess what? Nothing is certain except death and taxes.
But I have NEVER in 18 years had a virus on my linux box. I have never had anyone hack one, well, I take that back, one one time because I didn’t set ANYthing up on it and set it up to be hacked...
I have NEVER had a machine touched on my network behind a properly set up fire wall, but most importantly NEVER had a virus, and no, you can’t crack my machines.... and I doubt anyone can.
I manage several dozen PCs and in 10 years have never seen a virus on any machine that had an up-to-date AV program of any kind.
Back around 1998 or so Melissa got through a lot of scanners. Prior to that, people didn’t take the potential very seriously.
The Linux kernel has only been around since 1991, so that would make it seventeen years. And virii aren't the only things that can infest a box: worms, rootkits, back doors, and all sorts of other goodies can get in.
I have NEVER had a machine touched on my network behind a properly set up fire wall, but most importantly NEVER had a virus...
Now, that's not a function of Linux at all. That's a function of good security practice.
...and no, you can’t crack my machines.... and I doubt anyone can.
The GNU/Linux operating system and related open-source software applications are very good and significantly more secure than Windows, by default, because the operating system was designed with more of a focus on security than Windows. However, that doesn't mean it can't be broken, and thinking that it can't (or that your systems are impenetrable) is a very dangerous mindset.
Oh, and even if I could crack your boxen, I wouldn't, cause I have better things to do.