I confirm the issue and that building with https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=1012627;filename=030-linux518-suse-patch;msg=15 solved the problem.
Considering that the severity of this issue tends toward grave because you can left with corrupted VMs with actual virtualbox 6.1.34-dfsg-3 I would appreciate a lot to have this patch in a quick release. Thanks Mathias -- Mathias Behrle PGP/GnuPG key availabable from any keyserver, ID: 0xD6D09BE48405BBF6 AC29 7E5C 46B9 D0B6 1C71 7681 D6D0 9BE4 8405 BBF6