Oracle has released VirtualBox 5.2 Maintenance Release 2.
This release includes improvements and regression fixes for Oracle VM VirtualBox 5.1. Between them we can mention following regressions, now fixed:
GUI: various improvements for high resolution screens and virtual media manager
Shared clipboard: fixed hang with OS X host and Linux guest
Linux Guests: added support for kernel 4.14
Storage: fixed regression breaking iSCSI
Linux Guests: fixed various regressions introduced by 5.2.0
The Oracle VirtualBox Team