Oracle announced earlier today, September 6, the immediate availability for download of the VirtualBox 4.2.18 virtualization software for Linux, Mac OS X and Windows platforms.
VirtualBox 4.2.18 comes with fixes for the recently released Linux kernel 3.11, on both Linux hosts and guests, related to Netfilter modules issues after building the kernel modules.
Among other interesting changes brought by VirtualBox 4.2.18, we can mention that udev detection in the init script of Linux 3.x kernels has been fixed, and a PCI device identifier has been added to the vboxvideo.ko module, fixing DRI initialization under certain conditions.
Also, the application is now able to properly handle NMIs on Linux hosts with X2APIC enabled. A complete changelog, with all the fixes and improvements (for all platforms), can be found in the official announcement.