VirtualBox v4.1.18 is released. VirtualBox is a general-purpose full virtualizer for x86/x64 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox v4.1.16 Changelog:
This is a maintenance release. The following items were fixed and/or added since VirtualBox 4.1.16:
- VMM: fixed VERR_REM_VIRTUAL_CPU_ERROR under rare conditions after the guest has been reset (bug #5164 and others)
- VMM: fixed host freezes with 64-bit guests on 32-bit Linux hosts (bug #10528)
- VRDP: added a workaround for rdesktop clients not properly updating the screen size when minimized
- AHCI: fixed a rare bug which can cause a guest memory corruption after the guest storage controler has been reset
- NAT: another attempt to fix crashes under rare conditions (Windows hosts only; bug #10513)
- Mac OS X hosts: addressed issues running Leopard / Snow Leopard (bug #10631)
- Linux hosts / Bridged Networking: fixed the problem with device driver unloading on kernels 3.2.18 and newer due to an invalid reference counter (bug #10624)
- Linux hosts / guests: Linux 3.5-rc1 fixes
- Linux Additions: the guest content was sometimes not properly updated (bug #9887)
- Solaris Additions: installer fix for X.org Server 1.11 and 1.12

Download: VirtualBox v4.1.18
Source: Here