This update provides the new VirtualBox 5.1 series, currently based on 5.1.2 providing several perfomance enhancements
The highlights include:
It also resolves the following security issue:
Unspecified vulnerability in the Oracle VM VirtualBox component in Oracle Virtualization VirtualBox before 5.0.26 allows local users to affect availability via vectors related to Core (CVE-2016-3597).
For other fixes, see the referenced changelog.