virtualbox.org

Your problem may be different but when installing Guest Additions for Oracle Linux 7.4 I experienced problems with 5.2 and its corresponding guest additions. I was able to get it working by downgrading the guest additions to 5.1.30. Probably not a good long term solution since they should be a match...

I had same issue with Oracle Linux 7.4 and tracked the possible problem to the Guest additions that ships with 5.2 being broken. I rebuilt my VM and before adding the guest additions copied an older 5.1.30 guest addition .iso file over the C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso fi...