Moderate CentOS qemu-kvm Update


qemu-guest-agent-, qemu-guest-agent-, qemu-img-, qemu-kvm-, qemu-kvm-, qemu-kvm-tools-,
2018-01-18 11:07
2017-07-27 19:07
2017-04-01 19:08
2017-01-05 20:12


Updated qemu-kvm packages that fix two security issues and three bugs are
now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the
user-space component for running virtual machines using KVM.

Two integer overflow flaws were found in the QEMU block driver for QCOW
version 1 disk images. A user able to alter the QEMU disk image files
loaded by a guest could use either of these flaws to corrupt QEMU process
memory on the host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.
(CVE-2014-0222, CVE-2014-0223)

Red Hat would like to thank NSA for reporting these issues.

This update also fixes the following bugs:

* In certain scenarios, when performing live incremental migration, the
disk size could be expanded considerably due to the transfer of unallocated
sectors past the end of the base image. With this update, the
bdrv_is_allocated() function has been fixed to no longer return "True" for
unallocated sectors, and the disk size no longer changes after performing
live incremental migration. (BZ#1109715)

* This update enables ioeventfd in virtio-scsi-pci. This allows QEMU to
process I/O requests outside of the vCPU thread, reducing the latency of
submitting requests and improving single task throughput. (BZ#1123271)

* Prior to this update, vendor-specific SCSI commands issued from a KVM
guest did not reach the target device due to QEMU considering such commands
as invalid. This update fixes this bug by properly propagating
vendor-specific SCSI commands to the target device. (BZ#1125131)

All qemu-kvm users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing this
update, shut down all running virtual machines. Once all virtual machines
have shut down, start them again for this update to take effect.
Please see

Am I vulnerable?

The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.

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Affected package information

Release Package Patched in
6 qemu-guest-agent qemu-guest-agent-
qemu-guest-agent qemu-guest-agent-
qemu-img qemu-img-
qemu-kvm qemu-kvm-
qemu-kvm qemu-kvm-
qemu-kvm-tools qemu-kvm-tools-