Una vez instalado el rpm obtuve esto:
Trying to register the VirtualBox kernel modules using DKMS [FALLÃ] (Failed, trying without DKMS) Recompiling VirtualBox kernel modules [FALLÃ] (Look at /var/log/vbox-install.log to find out what went wrong)
Chequeamos lo que nos diga el log. Por si las dudas.
[root@~]# cat /var/log/vbox-install.log
Makefile:172: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR= and run Make again. Alto.
Precisamente ese es el error.