Oracle has released VirtualBox 6.1 Maintenance Release 4.
Oracle VM VirtualBox 6.1.4 release includes improvements and regression fixes for Oracle VM VirtualBox 6.1.
Notable bug fixes are:
VBoxManage: Restore old "--clipboard" option for modifyvm command, issue that affected mostly Vagrant users.
Linux guests: Support Linux Kernel 5.5 added
Windows host: Restore the ability to run VMs through Hyper-V, at the expense of performance
The Oracle VirtualBox Team