Critcal VM bug
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There's an extremely critical bug in the Xen, KVM, and native QEMU virtual machine platforms and appliances that makes it possible for attackers to break out of protected guest environments and take full control of the operating system hosting it, security researchers warned Wednesday.
http://arstechnica.com/security/2015/05/extremely-serious-virtual-machine-bug-threatens-cloud-providers-everywhere/