CWE Top 25: https://cwe.mitre.org/top25/archive/2024/2024_cwe_top25.html

Out of bounds write and read are more prevalent then UAF. There are multiple types of bugs that can produce OOB read or write though.

Not offhand, but every list of the common security bugs shows it's the top, by a wide margin.

That (or, more broadly, memory lifecycle bugs) would be my guess too.