Maybe I stepped a bit too far above by saying 'zero chance of Malware', should had been 'greatly reduced', I apologize for any confusion created by that comment.
Yes there has been Linux security holes found, although one thing that the open source community does that the closed source doesn't, all of the major distros puts their differences to the side, thousands of volunteers gets into action & a fix is shipped within 24-72 hours most of the time. Google never gets that 30 day (or whatever) grace period to publicly point out security non-fixes with Linux, as they sometimes (wrongfully) do with Microsoft.
Not that I'm siding or taking up for the latter, it's just that no one should be publishing these details, this creates a field day for Malware distributors & it's outright irresponsible on the side of Google for publishing these details. Fortunately, Microsoft doesn't retaliate in the same low blow manner & Linux devs keep a lid on issues until post fix. A few has gone for over a decade before discovery, hopefully from Malware distributors also.
All of that stated, perhaps the #1 reason why we seldom see Linux users looking for a way to cure infections, is it's low usershare. If Linux jumped to as little as 5% of the total, then more attacks would be launched. However, it's still harder for a Linux system to become infected, as any executable file has to be signed off on by typing in their password. This is even required for the updating system, and there's no showing of the passwords. If a Terminal is ran (same as 'cmd' on Windows), one won't even see the password being typed in, if the wrong one happens to be, will be prompted to retype the correct one.
The only near 'bulletproof' OS is one that either is never booted, or used offline only, a common practice within manufacturing facilities, and optical drives/USB ports are removed/blocked off to prevent sabotage. Some of these may be in a ventilated locked cage to further restrict access. Still, if one has the motivation, any OS can be infected by one with the right skills, regardless of brand, and another reason why Power over Ethernet should be disabled (or use wireless only), it's a backdoor to be exposed.
Hopefully this clears up my typo or knee jerk reaction above.
Cat