The 6.4.3 stable kernel has been released;
it contains a handful of fixes, mostly for problems associated with the per-VMA locking code. Anybody running 6.4
probably wants this update.

Note that there is a much larger 6.3.13
update going through a longer-than-usual review process that should show up
soon.

Source: LWN.net – Stable kernel 6.4.3 released