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Date: Thu, 10 Sep 2015 12:15:32 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Qinghao Tang <>
Subject: CVE request Qemu: ide: divide by zero issue


Qemu emulator built with the IDE disk and CD/DVD-ROM emulation support is 
vulnerable to a divide by zero issue. It could occur while executing an IDE 
command WIN_READ_NATIVE_MAX to determine the maximum size of a drive.

A privileged user inside guest could use this flaw to crash the Qemu instance 
resulting in DoS.

Upstream fix:

The fix disables undue IDE commands for CD-ROM drives.

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

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