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Date: Tue, 26 Sep 2017 10:26:27 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Jim Mattson <>
Subject: CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0)
 CR8 register


Linux kernel built with the KVM virtualisation support(CONFIG_KVM), with 
nested virtualisation(nVMX) feature enabled(nested=1), is vulnerable to a 
crash due to disabled external interrupts. As L2 guest could access(r/w) 
hardware CR8 register of the host(L0).

In a nested virtualisation setup, L2 guest user could use this flaw to 
potentially crash the host(L0) resulting in DoS.

Upstream patch

This issue was reported by Jim Mattson of

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

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