Verified VirtualBox v5.2.8 does NOT do this.a warning for users who use virtual machines with windows 10,
in the may update they have enhanced device security enabled called Device/Credential Guard that will prevent you from running you virtual machines as vmware will error out saying it is not compatible when you try to boot your existing VM's. but just to note i am using vmware player so i am not sure if this is happening with virtualbox or not but just a heads up. there is currently a work around right now that seems to be working for me but not sure if i will have to keep performing the workaround every so often or not yet
here is a link describing the issue for vmware:
All my VM's, both windows and Linux, run just fine after upgrading the Host to v1903.