Oracle has released VirtualBox 6.0 Maintenance Release 6.
Oracle VM VirtualBox 6.0.6 release includes improvements and regression fixes for Oracle VM VirtualBox 6.0.
Notable bug fixes are:
User Interface: different fixes related to file manager and unattended installation
Virtualization: fixes dedicated to nested Virtualization on AMD CPUs
Storage: added support for QCOW2 version 3 and improved IDE PCI emulation
Graphics: different fixes for VMSVGA emulation and 3d support
Linux Host and Guest: added support for Kernel 5.0 and 5.1
Windows Guests: fixed issues related to WDDM and VBoxSVGA drivers
Security Fixes: this maintenance release includes "Oracle Critical Patch Updates" April, 2019; further details related to CPU April, 2019 are available here.
The Oracle VirtualBox Team