RHSA-2015:0868 - Security Advisory

Topic

Updated qemu-kvm-rhev packages that fix one security issue and one bug are
now available for Red Hat Enterprise Virtualization.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link 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 in environments
managed by Red Hat Enterprise Virtualization Manager.

It was found that the Cirrus blit region checks were insufficient. A
privileged guest user could use this flaw to write outside of
VRAM-allocated buffer boundaries in the host's QEMU process address space
with attacker-provided data. (CVE-2014-8106)

This issue was discovered by Paolo Bonzini of Red Hat.

This update also fixes the following bug:

• Previously, the effective downtime during the last phase of a live

migration would sometimes be much higher than the maximum downtime
specified by 'migration_downtime' in vdsm.conf. This problem has been
corrected. The value of 'migration_downtime' is now honored and the
migration is aborted if the downtime cannot be achieved. (BZ#1142756)

All users of qemu-kvm-rhev are advised to upgrade to these updated
packages, which contain a backported patch to correct this issue. 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 6 x86_64

Fixes

• BZ - 1169454 - CVE-2014-8106 qemu: cirrus: insufficient blit region checks

CVEs

• CVE-2014-8106

References

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