Acivate on system following repo $ sudo dnf copr enable jforbes/kernel-stabilization and upgrade system via
$ sudo dnf update -y
[boris@ServerFedora38 ~]$ rpm -qa | grep kernel | grep "6.4.2"
kernel-modules-core-6.4.2-200.fc38.x86_64
kernel-core-6.4.2-200.fc38.x86_64
kernel-modules-6.4.2-200.fc38.x86_64
kernel-6.4.2-200.fc38.x86_64
kernel-devel-6.4.2-200.fc38.x86_64
kernel-modules-core-6.4.2-201.fc38.x86_64
kernel-core-6.4.2-201.fc38.x86_64
kernel-modules-6.4.2-201.fc38.x86_64
kernel-devel-6.4.2-201.fc38.x86_64
kernel-devel-matched-6.4.2-201.fc38.x86_64
kernel-6.4.2-201.fc38.x86_64
Now reboot system and setup rpmfusion :-
$ 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@ServerFedora38 ~]$ lsmod | grep -i vbox
vboxnetadp 28672 0
vboxnetflt 40960 0
vboxdrv 655360 2 vboxnetadp,vboxnetflt
You are ready to perform testing deployment of Ubuntu 23.04 Guest via Virtual Box 7.0.8 under kernel kernel-6.4.2-201.fc38.x86_64
Tuning SparkyLinux 7 Guest screen size via VBoxGuestAdditions_7.0.8.iso
Tuning Ubuntu 23.04 Guest screen size via VBoxGuestAdditions_7.0.8.iso
References