VirtualBox recompiling kernel with Secure Boot.

vbox-modprobe.sh

#!/usr/bin/bash
openssl req -new -x509 -newkey rsa:2048 -keyout vbox.keyout -outform DER -out vbox.der -nodes -days 36500 -subj "/CN=VBoxDrv/"
mokutil --import vbox.der
### after the reboot yo are able to add it to the secure boot, please select it.
reboot

vbox-modprobe2.sh

#!/bin/bash
### After reboot and signed vboxdrv and the others modules.
### selinux
# chcon unconfined_u:object_r:lib_t:s0 /usr/lib/virtualbox/vboxdrv.sh
### OR
# setenforce permissive
/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxdrv)
/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxnetflt)
/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxnetadp)
/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxpci)

#/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxguest)
#/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxsf)
#/usr/src/kernels/$(uname -r)/scripts/sign-file sha256 ./vbox.keyout ./vbox.der $(modinfo -n vboxvideo)


systemctl restart vboxdrv
systemctl status vboxdrv
echo "now run sudo /sbin/vboxconfig"
/sbin/vboxconfig

reminder: SELinux can cause complication. simple solution set temporarly as permissive especially if you are using virtualbox rpm repository.