Important CentOS qemu-kvm Security Update


libcacard-1.5.3-86.el7_1.5.i686.rpm, libcacard-1.5.3-86.el7_1.5.x86_64.rpm, libcacard-devel-1.5.3-86.el7_1.5.i686.rpm, libcacard-devel-1.5.3-86.el7_1.5.x86_64.rpm, libcacard-tools-1.5.3-86.el7_1.5.x86_64.rpm, qemu-img-1.5.3-86.el7_1.5.x86_64.rpm, qemu-kvm-1.5.3-86.el7_1.5.src.rpm, qemu-kvm-1.5.3-86.el7_1.5.x86_64.rpm, qemu-kvm-common-1.5.3-86.el7_1.5.x86_64.rpm, qemu-kvm-tools-1.5.3-86.el7_1.5.x86_64.rpm,
2018-01-18 11:10
2017-07-27 19:09
2017-04-01 19:09
2017-01-05 20:13


Updated qemu-kvm packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important 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.

A heap buffer overflow flaw was found in the way QEMU's IDE subsystem
handled I/O buffer access while processing certain ATAPI commands.
A privileged guest user in a guest with the CDROM drive enabled could
potentially use this flaw to execute arbitrary code on the host with the
privileges of the host's QEMU process corresponding to the guest.

An out-of-bounds memory access flaw, leading to memory corruption or
possibly an information leak, was found in QEMU's pit_ioport_read()
function. A privileged guest user in a QEMU guest, which had QEMU PIT
emulation enabled, could potentially, in rare cases, use this flaw to
execute arbitrary code on the host with the privileges of the hosting QEMU
process. (CVE-2015-3214)

Red Hat would like to thank Matt Tait of Google's Project Zero security
team for reporting the CVE-2015-3214 issue. The CVE-2015-5154 issue was
discovered by Kevin Wolf of Red Hat.

This update also fixes the following bug:

* Due to an incorrect implementation of portable memory barriers, the QEMU
emulator in some cases terminated unexpectedly when a virtual disk was
under heavy I/O load. This update fixes the implementation in order to
achieve correct synchronization between QEMU's threads. As a result, the
described crash no longer occurs. (BZ#1233643)

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
7 libcacard libcacard-1.5.3-86.el7_1.5.i686.rpm
libcacard libcacard-1.5.3-86.el7_1.5.x86_64.rpm
libcacard-devel libcacard-devel-1.5.3-86.el7_1.5.i686.rpm
libcacard-devel libcacard-devel-1.5.3-86.el7_1.5.x86_64.rpm
libcacard-tools libcacard-tools-1.5.3-86.el7_1.5.x86_64.rpm
qemu-img qemu-img-1.5.3-86.el7_1.5.x86_64.rpm
qemu-kvm qemu-kvm-1.5.3-86.el7_1.5.src.rpm
qemu-kvm qemu-kvm-1.5.3-86.el7_1.5.x86_64.rpm
qemu-kvm-common qemu-kvm-common-1.5.3-86.el7_1.5.x86_64.rpm
qemu-kvm-tools qemu-kvm-tools-1.5.3-86.el7_1.5.x86_64.rpm