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Date: Fri, 9 Mar 2018 15:25:36 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Ross Lagerwall <>
Subject: CVE-2018-7858 Qemu: cirrus: OOB access when updating vga display


Quick emulator(QEMU) built with the Cirrus CLGD 54xx VGA Emulator support is 
vulnerable to an out-of-bounds access issue. It could occur while updating VGA 
display, after guest has adjusted the display dimensions.

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

Upstream patch:

This issue was reported by Ross Lagerwall of

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

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