after an update to openSUSE 15.3, I just installed virtualbox from virtualbox.org.
Everything went fine.
After starting virtualbox, there was the need to run /sbin/vboxconfig, which ends with the following problem:
*This system is currently not set up to build kernel modules.
Please install the Linux kernel “header” files matching the current kernel
for adding new hardware support to the system.
The distribution packages containing the headers are probably:
kernel-default-devel kernel-default-devel-5.5.7-1 *
My openSUSE 15.3 only provides kernel-default-devel for 5.3, although the kernel is 5.5.