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

   Hello,

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
--------------
   -> https://git.kernel.org/linus/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f

This issue was reported by Jim Mattson of Google.com.

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

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