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List:       oss-security
Subject:    [oss-security] CVE-2017-12154 Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register
From:       P J P <ppandit () redhat ! com>
Date:       2017-09-26 4:57:08
Message-ID: nycvar.YSQ.7.76.1709261022090.10045 () wniryva
[Download RAW message or body]

   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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