The vulnerability affects 64-bit operating systems and virtualization software running on Intel CPU hardware.

The U.S. Computer Emergency Readiness Team (CERT) has issued an alert for a dangerous guest-to-host virtual machine escape vulnerability affecting virtualization software from multiple vendors.

The vulnerability, which affects 64-bit operating systems and virtualization software running on Intel CPU hardware, exposes users to local privilege escalation attack or a guest-to-host virtual machine escape.

From the advisory:

--> Please see the rest on the website. Please also note all virtualization products are exposed apart from VMware!

http://www.zdnet.com/blog/security/us-cert-warns-of-guest-to-host-vm-escape-vulnerability/12471