> you should at least have rebooted your PC 65 times

Really not every CVE in the kernel applies to every system and configuration. You can compile the linux kernel in all kinds of different ways and a decent number of security vulnerabilities found in any given year only apply to unusual configurations.

Looking at those 65 CVEs[1] and thinking just about the desktop use case (as that's what this is about), none of them really stand out as "zomg update immediately!" A number just aren't applicable at all for most desktop users, and quite a lot of others aren't readily exploitable, and are not cause for a panic update and reboot.

[1]: https://www.cvedetails.com/vulnerability-list.php?vendor_id=...

Unless every single one of those CVEs was actively exploited at the time a fix was committed to the kernel, no. Just no.

Even then, no.

Not every CVE affects every system. The kernel is modular and most people don't run every module.

In addition to what others have said, CVSs often come in related groups, and are patched together. It's likely that a single kernel security release will fix multiple related CVEs all at once.