

Upgrades is any security or big fix as well. Those tend to be quite safe in point release distros. Upgrading to a new point release version is has all the same problems the rolling release had over the same period all bundle in one messy upgrade (which makes them a huge pain to deal with as they often compound). But between those, the patch upgrades tend to be quite smooth.
I would say the over a longer time period rolling release break in bigger way less often. But they tend to have more but smaller breakages that are easy to trivial to fix.



You cannot do that analysis with one sample. Why pick one day? That is an arbatary amount? Pick the 1 hour or minute that the CVE was released and you will find rust might be responsible for 100% of CVEs, Take a Week or year and that number drops dramatically. Pick the next day and that drops to 0%. You can select any % you want if you change what time period you are looking at.
The fact that there has been one cve in 5 years of rust in the kernel is a bigger tell. There will be more rust CVEs, and each one is going to be big news as they happen so rarely.