CVE-2017-2596 Kernel: kvm: page reference leakage in handle_vmon

[P J P <ppandit () redhat com>]

  Hello,

Linux kernel built with the KVM virtualisation support(CONFIG_KVM), with 
nested virtualisation(nVMX) feature enabled(nested=1), is vulnerable to host 
memory leakage issue. It could occur while emulating VMXON instruction in 
'handle_vmon'.

A L1 guest user could use this flaw to leak host memory potentially resulting 
in DoS.

Upstream patch:
---------------
  -> https://www.spinics.net/lists/kvm/msg144319.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1417812

'CVE-2017-2596' is assigned to this issue by Red Hat Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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