Date: Fri, 20 May 2016 12:15:55 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> Subject: CVE-2016-4440 Kernel: kvm: vmx: incorrect state update leading to MSR access Hello, 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 host. Upstream patch: --------------- -> http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/152191 Reference: ---------- -> https://bugzilla.redhat.com/show_bug.cgi?id=1337806 -> http://comments.gmane.org/gmane.comp.emulators.kvm.devel/152100 '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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