x86_64, i5-7200U w/embedded GPU, HW model HP 850 G4, KDE, VPN IPsec, VirtualBox 6.0.4.
As far as I understand and can evaluate also rbhz 1701096 added to 5.0.9-301 works well. With 5.0.8 and 5.0.9-300, VirtualBox kernel modules did not load unless I disabled SecureBoot; with 5.0.9-301 the modules load with SecureBoot enabled again. Maybe #1701096 should be added to the list of solved bugs?
x86_64, i5-7200U w/embedded GPU, HW model HP 850 G4, KDE, VPN IPsec. Note: VirtualBox-5.2.24-1.fc29.x86_64 does not work with any 5.0 kernel, because its out-of-the-tree kernel modules fail to compile. As far as I understand this issue is not in scope of Fedora kernel bug fixing..