VirtualBox 5.2.40 (released April 14 2020)
https://www.virtualbox.org/wiki/Changelog-5.2#v40

This is a maintenance release. The following items were fixed and/or added:

VBoxManage: Multiple fixes for guestcontrol command
USB: Multiple enhancements improving prformance and stability
Graphics: Enhancements in 2D and 3D acceleration and rendering
API: Fix exception handling bug in Python bindings
Linux: Support Linux kernel 5.6 (bug #19312)


VirtualBox 6.0.20 (released April 14 2020)
https://www.virtualbox.org/wiki/Changelog-6.0#v20

This is a maintenance release. The following items were fixed and/or added:

USB: Multiple enhancements improving prformance and stability
VBoxManage: Multiple fixes for guestcontrol command
Graphics: Enhancements in 2D and 3D acceleration and rendering
API: Fix for exception handling bug in Python bindings
Linux host and guest: Support Linux kernel 5.6 (bug #19312)