Oracle VM VirtualBox 4.1.18 was just released at the community or Oracle download sites.

This release is a maintenance release containing bug fixes and stability improvements:

• VMM: fixed VERR_REM_VIRTUAL_CPU_ERROR under rare conditions after the guest has been reset
• VMM: fixed host freezes with 64-bit guests on 32-bit Linux hosts
  
• 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
  
• Mac OS X hosts: addressed issues running Leopard / Snow Leopard
  
• Linux hosts / Bridged Networking: fixed the problem with device driver unloading on kernels 3.2.18 and newer due to an invalid reference counter
  
• Linux hosts / guests: Linux 3.5-rc1 fixes
• Linux Additions: the guest content was sometimes not properly updated
  
• Solaris Additions: installer fix for X.org Server 1.11 and 1.12