CVE request: Kernel: kvm: out of bounds memory access via vcpu_id

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

  Hello,

Linux kernel built with the Kernel-based Virtual Machine(CONFIG_KVM) support 
is vulnerable to an out-of-bounds memory access issue. It could occur on x86 
platform, while servicing I/O APIC requests with larger vcpu_id.

A guest user/process could use this flaw to crash the host kernel resulting in 
DoS or it could potentially be used to escalate privileges on a host.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/81cdb259fb6d8c1c4ecfeea389ff5a73c07f5755

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1400804

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