Oracle has released VirtualBox 5.2 Maintenance Release 22.
Oracle VM VirtualBox 5.2.22 release includes improvements and regression fixes for Oracle VM VirtualBox 5.2.
Between them we can mention:
Audio: fixed a regression and a potential in the HDA emulation
Windows: fixed an incompatibility with latest Windows 10 version and issues on bridged networking driver crash
Linux Guest Additions: fixes for kernel modules on recent distributions and kernel 4.19 and further fixes.
The Oracle VirtualBox Team