You should check then the stock VirtualBox package on Leap 15.2. It contains the possible fix for the Leap 15.2 kernel. And we can't offer further help here; if it's about the openSUSE VirtualBox package (either the official Leap 15.2 one or in OBS Virtualization project), we can hunt for the bug. But in this case, you're building from the scratch by yourself, so...