(In reply to Stefan Hundhammer from comment #40) > A complete shot in the dark (and, as noted before, I know nothing about > kernel stuff and how all that works): > > https://build.opensuse.org/package/view_file/openSUSE:Factory/virtualbox/ > fixes_for_5.9.patch?expand=1 I am the author of that patch. All of those changes are needed because the kernel developers changed the API in a number of places in the 5.9 kernel. Without those changes, the modules would not build.