This update for virtualbox provides version 4.3.36 with the following fixes and improvements:

- GUI: Improved handling of text selection mouse pointer
- GUI: Properly limit the number of VCPUs to the number of physical cores on Mac OS X
- 3D: Fixed state handling under certain conditions
- Host services: Fixed a crash during VM shutdown under rare conditions
- ExtPack: Black-list Extension Packs older than 4.3.30 due to incompatible changes not being properly handled in the past
- Linux hosts: .desktop file compatibility issue
- Linux hosts / guests: Fixes for RHEL 7.2
- Linux/Mac OS X hosts: Fixed a VM hang during startup under certain circumstances
- Linux Additions: Prevent the compiler from doing dead-code elemination on vital code in guest / host communication
- Linux Additions: Fixes for Linux 4.5
- X11 Additions: Added basic support for X.Org Server 1.18 (3D requires additional fixes)