An independent exploit developer and vulnerability researcher has publicly disclosed a zero-day vulnerability in VirtualBox software. The vulnerability occurs due to memory corruption issues and affects Intel PRO / 1000 MT Desktop (82540EM) network card (E1000) When the network mode is set to NAT (Network Address Translation) The flaw is independent of the type of operating system being used by the virtual and host machines because it resides in a shared code base. There is no patch yet available, but users can protect themselves against potential cyber attacks.
Source: https://thehackernews.com/2018/11/virtualbox-zero-day-exploit.html