According to the official changelog, VirtualBox 4.3.14 RC1 can now be compiled in the recently released Red Hat Enterprise Linux 7 operating system. It brings USB performance fixes, several improvements to the 3D components, and properly detects the Microsoft Windows 8.1 guest OS type.
Furthermore, it improves the MSR emulation on various hardware, improves MSI handling, fixes a #UD exception for 64-bit guests, fixes a timekeeping error that appeared after resuming a multi-CPU virtual machine, and repairs two potential crashes on the graphical user interface.