2.1 - RHSA-2017:0621

Problem Description:

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

Security Fix(es):

* An integer overflow flaw and an out-of-bounds read flaw were found in the way QEMU's VGA emulator set certain VGA registers while in VBE mode. A privileged guest user could use this flaw to crash the QEMU process instance. (CVE-2016-3712)

Red Hat would like to thank Zuozhi Fzz (Alibaba Inc.) for reporting this issue.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

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.

5. Bugs fixed (https://bugzilla.redhat.com/):

876993 - qemu-kvm: vm's become non-responsive during migrate disk load from 2 domains to a 3ed 1281713 - system_reset should clear pending request for error (IDE) 1292678 - Qemu should report error when cmdline set threads=2 in amd host 1294941 - QEMU crash on snapshot revert when using Cirrus 1297653 - "qemu-img convert" can't create a fully allocated image passed a "-S 0" option 1300626 - e1000/rtl8139: qemu mac address can not be changed via set the hardware address in guest 1318712 - CVE-2016-3712 qemu-kvm: Out-of-bounds read when creating weird vga screen surface 1320066 - Qemu should not report error when cmdline set threads=2 in Intel host 1333697 - qemu-kvm: /builddir/build/BUILD/qemu-kvm-0.12.1.2/hw/virtio-scsi.c:724: virtio_scsi_push_event: Assertion `event == 0' failed 1346981 - Regression from CVE-2016-3712: windows installer fails to start [rhel-6.9] 1356924 - rtl8139 driver hangs in widows guests 1361490 - system_reset should clear pending request for error (virtio-blk) 1392287 - Core dump occurs when query qtree after migration with "-vga cirrus" 1392520 - [RHEL6.9] KVM guest shuts itself down after 128th reboot