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Date: Wed, 17 Oct 2018 17:24:01 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Fakhri Zulkifli <>
Subject: CVE-2018-12617 Qemu: qemu-guest-agent: Integer overflow in
 qmp_guest_file_read may lead to crash


The QEMU Guest Agent in QEMU is vulnerable to an integer overflow in the 
qmp_guest_file_read(). An attacker could exploit this by sending a crafted QMP 
command (including guest-file-read with a large count value) to the agent via 
the listening socket to trigger a g_malloc() call with a large memory chunk 
resulting in a segmentation fault.

A user could use this flaw to crash the Qemu-guest-agent resulting in DoS.

Upstream Patch:

This issue was reported by Fakhri Zulkifli.

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

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