Synopsis

Important: qemu-kvm security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated qemu-kvm packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team 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. qemu-kvm is the user-space component
for running virtual machines using KVM.

It was found that the virtio subsystem in qemu-kvm did not properly
validate virtqueue in and out requests from the guest. A privileged guest
user could use this flaw to trigger a buffer overflow, allowing them to
crash the guest (denial of service) or, possibly, escalate their privileges
on the host. (CVE-2011-2212)

It was found that the virtio_queue_notify() function in qemu-kvm did not
perform sufficient input validation on the value later used as an index
into the array of virtqueues. An unprivileged guest user could use this
flaw to crash the guest (denial of service) or, possibly, escalate their
privileges on the host. (CVE-2011-2512)

Red Hat would like to thank Nelson Elhage for reporting CVE-2011-2212.

This update also fixes the following bug:

• A bug was found in the way vhost (in qemu-kvm) set up mappings with the
  host kernel's vhost module. This could result in the host kernel's vhost
  module not having a complete view of a guest system's memory, if that guest
  had more than 4 GB of memory. Consequently, hot plugging a vhost-net
  network device and restarting the guest may have resulted in that device no
  longer working. (BZ#701771)
  

All users of qemu-kvm should upgrade to these updated packages, which
contain backported patches to resolve 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.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 6.1 x86_64
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.1 x86_64
• Red Hat Virtual Storage Appliance (from RHUI) 6.1 x86_64

Fixes

• BZ - 713589 - CVE-2011-2212 qemu-kvm: virtqueue: too-large indirect descriptor buffer overflow
• BZ - 717399 - CVE-2011-2512 qemu-kvm: OOB memory access caused by negative vq notifies

CVEs

• CVE-2011-2512
• CVE-2011-2212

References

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

Red Hat Enterprise Linux Server 6

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db

Red Hat Enterprise Linux Server - Extended Update Support 6.1

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db

Red Hat Enterprise Linux Workstation 6

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db

Red Hat Enterprise Linux Desktop 6

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db

Red Hat Enterprise Linux Server from RHUI 6

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db

Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.1

SRPM
qemu-kvm-0.12.1.2-2.160.el6_1.2.src.rpm	SHA-256: ceb1fadcc152777ef73ff5607716592a3a5ff66daa644d5f631881787a67e102
x86_64
qemu-img-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 86fbbba582bb8272b713135805c150af6766a70e130586d42d736536aad8e6da
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 0efbde22d4aa1c82743766035befc395389444b11fd341bfd9e8fdb1e8eb5fb3
qemu-kvm-debuginfo-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 7642ec0c5c0d4995bf957336e66be227d65b4bba638fe9e8e57317ba521b6b71
qemu-kvm-tools-0.12.1.2-2.160.el6_1.2.x86_64.rpm	SHA-256: 41244008eea8568b56ba6bdc8e5ba64109163790a199feae8c1ba83b8ed294db