To make system ready for VitualBox 7 setup via rpmfusion repos,
install the Linux kernel "header" files matching the current kernel for adding new hardware support to the system. The distribution package containing the headers is probably: kernel-devel-6.0.9-300.fc37.x86_64. Kernel packages installation has been done as follows.
[boris@Server37fedora ~]$ rpm -qa | grep kernel | grep 6.0.9
kernel-core-6.0.9-300.fc37.x86_64
kernel-modules-6.0.9-300.fc37.x86_64
kernel-devel-6.0.9-300.fc37.x86_64
kernel-devel-matched-6.0.9-300.fc37.x86_64
kernel-6.0.9-300.fc37.x86_64
Setup rpmfusion :-
$ sudo dnf install \
https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm
$ sudo dnf \
install https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
$ sudo dnf install VirtualBox kernel-devel-$(uname -r) akmod-VirtualBox
$ sudo akmods
$ sudo systemctl restart vboxdrv
$ lsmod | grep -i vbox
[boris@Server37fedora ~]$ lsmod | grep -i vbox
vboxnetadp 28672 0
vboxnetflt 32768 0
vboxdrv 577536 2 vboxnetadp,vboxnetflt
Download VBoxGuestAdditions_7.0.4.iso link https://w0.dk/~chlor/vboxguestadditions/
After Guest setup shutdown guest and mount VBoxGuestAdditions_7.0.4.iso via GUI of VitualBox 7
Reboot guest and
$ sudo mount /dev/sr0 /media
inside Vbox's VM
