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Date: Thu, 7 Jan 2016 16:29:15 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
Subject: CVE-2015-7513 Kernel: kvm: divide by zero issue leads to DoS

    Hello,

Linux kernel built with the KVM virtualisation support(CONFIG_KVM) is 
vulnerable to a divide by zero issue. It occurs in the KVM module's 
Programmable Interval Timer(PIT) emulation, when PIT counters for channel 1 or 
2 are set to zero(0) and a privileged user inside guest attempts to read 
those.

A privileged guest user with access to PIT I/O ports, could use this issue to 
crash the host kernel resulting in DoS.

Upstream patch:
---------------
   -> https://git.kernel.org/linus/0185604c2d82c560dab2f2933a18f797e74ab5a8

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1284847

It requires host user to set the PIT channel counters to zero(0).

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

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