RHEL 7 : qemu-kvm-rhev (RHSA-2016:0084)
High Nessus Plugin ID 117310
Synopsis
The remote Red Hat host is missing one or more security updates.
Description
Updated qemu-kvm-rhev packages that fix two security issues and three
bugs are now available for Red Hat Enterprise Virtualization.
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-rhev package
provides the user-space component for running virtual machines using
KVM.
A use-after-free flaw was found in the way QEMU's IDE AHCI emulator
processed certain AHCI Native Command Queuing (NCQ) AIO commands. A
privileged guest user could use this flaw to crash the QEMU process
instance or, potentially, execute arbitrary code on the host with
privileges of the QEMU process. (CVE-2016-1568)
An out-of-bounds read/write flaw was discovered in the way QEMU's
Firmware Configuration device emulation processed certain firmware
configurations. A privileged (CAP_SYS_RAWIO) guest user could use this
flaw to crash the QEMU process instance or, potentially, execute
arbitrary code on the host with privileges of the QEMU process.
(CVE-2016-1714)
Red Hat would like to thank Qinghao Tang of Qihoo 360 Marvel Team for
reporting the CVE-2016-1568 issue, and Donghai Zhu of Alibaba for
reporting the CVE-2016-1714 issue.
This update also fixes the following bugs :
* Incorrect handling of the last sector of an image file could trigger
an assertion failure in qemu-img. This update changes the handling of
the last sector, and no assertion failure occurs. (BZ#1299345)
* Previously, rebooting a guest after multiple memory hot-plugs in
some cases caused the qemu-kvm process to terminate unexpectedly, and
the reboot to fail. This update fixes the problem, and guests with
hot-plugged memory reboot successfully. (BZ#1288096)
* When the OHCI driver received an interrupt during the suspending
process, the interrupt was not acknowledged. As a consequence, the
interrupt kept being sent repeatedly, and the system became
unresponsive. This update modifies the suspend procedure to
acknowledge the interrupt, which prevents the described problem.
(BZ#1298971)
All qemu-kvm-rhev 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.
Solution
Update the affected packages.