Issued:
2015-05-13
Updated:
2015-05-13

RHSA-2015:0998 - 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.

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

ProductVersionArch
Red Hat Enterprise Linux for x86_64 - Extended Update Support6.6x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support6.6i386
Red Hat Enterprise Linux for Scientific Computing6x86_64
Red Hat Enterprise Linux Workstation6x86_64
Red Hat Enterprise Linux Workstation6i386
Red Hat Enterprise Linux Server6x86_64
Red Hat Enterprise Linux Server6i386
Red Hat Enterprise Linux Server from RHUI6x86_64
Red Hat Enterprise Linux Server from RHUI6i386
Red Hat Enterprise Linux Server - TUS6.6x86_64
Red Hat Enterprise Linux Server - Extended Update Support from RHUI6.6x86_64
Red Hat Enterprise Linux Server - Extended Update Support from RHUI6.6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6i386
Red Hat Enterprise Linux Server - AUS6.6x86_64
Red Hat Enterprise Linux EUS Compute Node6.6x86_64
Red Hat Enterprise Linux Desktop6x86_64
Red Hat Enterprise Linux Desktop6i386

Updated Packages

  • qemu-guest-agent-0.12.1.2-2.448.el6_6.3.x86_64.rpm
  • qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.3.x86_64.rpm
  • qemu-guest-agent-0.12.1.2-2.448.el6_6.3.i686.rpm
  • qemu-kvm-0.12.1.2-2.448.el6_6.3.src.rpm
  • qemu-img-0.12.1.2-2.448.el6_6.3.x86_64.rpm
  • qemu-kvm-0.12.1.2-2.448.el6_6.3.x86_64.rpm
  • qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.3.i686.rpm
  • qemu-kvm-tools-0.12.1.2-2.448.el6_6.3.x86_64.rpm

Fixes

CVEs

References

Additional information