Issued:

2015-05-27

Updated:

2015-05-27

RHSA-2015:1031 - Important: qemu-kvm security update

Synopsis

Important: qemu-kvm security update

Type/Severity

Security Advisory Important

Topic

Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 6.5 Extended Update Support.

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 package provides the user-space component for running virtual machines using KVM.

An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller (FDC) handled FIFO buffer access while processing certain FDC commands. A privileged guest user could use this flaw to crash the guest or, potentially, execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest. (CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting this issue.

All qemu-kvm users 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

Updated Packages

• qemu-img-0.12.1.2-2.415.el6_5.15.x86_64.rpm
• qemu-kvm-0.12.1.2-2.415.el6_5.15.src.rpm
• qemu-kvm-tools-0.12.1.2-2.415.el6_5.15.x86_64.rpm
• qemu-guest-agent-0.12.1.2-2.415.el6_5.15.i686.rpm
• qemu-kvm-0.12.1.2-2.415.el6_5.15.x86_64.rpm
• qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.i686.rpm
• qemu-guest-agent-0.12.1.2-2.415.el6_5.15.x86_64.rpm
• qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.x86_64.rpm

Fixes

• This content is not included.BZ - 1218611

CVEs

• CVE-2015-3456

References

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

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.