I’ve been using Linux since 2005, and I’ve heard all sorts of stories about Linux having “security problems”, and almost every time it turns out to be a problem that can’t be exploited on it’s own. but requires the use of other vulnerabilities.
The only exception I can recall is the zx util compression tool, which was detected before it was rolled out.

Zero day vulnerabilities have been non existent for 20 years to my knowledge.