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Date: Fri, 20 May 2016 12:15:55 +0530 (IST)
From: P J P <>
To: oss security list <>
Subject: CVE-2016-4440 Kernel: kvm: vmx: incorrect state update leading to
 MSR access


Linux kernel built with the Kernel-based virtual machine(CONFIG_KVM) along 
with Hyper-v Synthetic Interrupt Controller(SynIC) support is vulnerable to an 
undue APIC register access issue. In that a guest with SynIC enabled, could 
gain access to host's Machine Specific Registers(MSR).

A privileged user inside guest could use this flaw to crash the host kernel 
resulting in DoS OR potentially leverage it to escalate privileges on the 

Upstream patch:


'CVE-2016-4440' has been assigned to this issue by Red Hat Inc.

Thank you.
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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