Summary: 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: A ring3 attacker may be able to specifically craft a stack frame to be executed by ring0 (kernel) after a general protection exception (#GP). The fault will be handled before the stack switch, which means the exception handler will be run at ring0 with an attacker’s chosen RSP causing a privilege escalation. Affected vendors include Intel Corp., FreeBSD, Microsoft, NetBSD, Oracle, RedHat, SUSE Linux and Xen. The US-CERT advisory contains a full list of affected software and links to vendor-supplied patches. VMWare says its products are not affected by this issue.