Synopsis

Important: qemu-kvm-rhev security and bug fix update

Type/Severity

Security Advisory: Important

Topic

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.

Description

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

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

• Red Hat Virtualization 3 for RHEL 7 x86_64
• Red Hat Virtualization for IBM Power LE 3 ppc64le

Fixes

• BZ - 1288096 - qemu quit when rebooting guest which hotplug memory >=13 times
• BZ - 1288532 - CVE-2016-1568 Qemu: ide: ahci use-after-free vulnerability in aio port commands
• BZ - 1296060 - CVE-2016-1714 Qemu: nvram: OOB r/w access in processing firmware configurations
• BZ - 1299345 - [abrt] qemu-img: get_block_status(): qemu-img killed by SIGABRT

CVEs

• CVE-2016-1568
• CVE-2016-1714

References

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

Red Hat Virtualization 3 for RHEL 7

SRPM
qemu-kvm-rhev-2.3.0-31.el7_2.7.src.rpm	SHA-256: 7dbf3349a816145d42175f821bd71471fe08c94ba4e70df8b84e86d880ed60fb
x86_64
libcacard-devel-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: e82d98108b8db9f2fb7f4540b900e35caa709118dbd443cbe04a0078bfa164ee
libcacard-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: 56db0ca491ae7e6f0ccc7d42b798044548bc4ed1e815020d15df4f0f640f10d3
libcacard-tools-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: 311dcf5767ce0242a0505bc706c2125ae99a5302a47b6a40629cc15529e2b6c7
qemu-img-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: f9fcea0ec3920b8cc96e32b9afdc237be0025e5eb7559e648f9823f32ff07b64
qemu-kvm-common-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: 758e9076b99c8d54459a8d0bc18a0db527e019f95654b8f3298dab681a32148b
qemu-kvm-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: d8498872351bb5d2133fba428c0459c0fe8f24568498cc06c993b79316c2722f
qemu-kvm-rhev-debuginfo-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: adf2fabe48aee339cc1a1a553a5c4c9a16dcb01207bf543c17d79f74700f44b3
qemu-kvm-tools-rhev-2.3.0-31.el7_2.7.x86_64.rpm	SHA-256: 004e8d119361e952aea70264d535cf44394093691da32439e6fa1107e2e8b374

Red Hat Virtualization for IBM Power LE 3

SRPM
qemu-kvm-rhev-2.3.0-31.el7_2.7.src.rpm	SHA-256: 7dbf3349a816145d42175f821bd71471fe08c94ba4e70df8b84e86d880ed60fb
ppc64le
libcacard-devel-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: b40b11649e5260f9951f89d41fa03773eea36eb990e08075b4120e7c7d035dfe
libcacard-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: ae0d3e9db7a76ad595a8df73dc75ba49f5e0967b335b2670edec9c1002e5b7cb
libcacard-tools-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: c6df941538539a814787a86e8bc8f2063e3d2bb4e2effda4e3034ee310d6bc9d
qemu-img-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: 13009242a283a321c98946cec989bfd43ca1a33684f0d9d87f7b8681dd7ed07d
qemu-kvm-common-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: a461648d31c9c09bf10a5d2ce643a0b7a78515bdef905fa596b9d8f5fca3aaac
qemu-kvm-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: 16010d5a8d649e1e26c59f9f3bad18ed325cdee01027648955f84de4386d4704
qemu-kvm-rhev-debuginfo-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: 0f70f66bd4e6fa99b1f5d3113c65c377f4c389e5630f3209f0c3dc3c96dd815b
qemu-kvm-tools-rhev-2.3.0-31.el7_2.7.ppc64le.rpm	SHA-256: c7115d2ab929878a099c41193e6ef6901349b131b8a40b64c5a7fde4905cdc4d