RHSA-2017:0621 - Security Advisory

Topic

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.

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.

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.

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386

Fixes

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

CVEs

• CVE-2016-3712

References

• https://access.redhat.com/security/updates/classification/#moderate