Issued:
2018-05-21
Updated:
2018-05-21

RHSA-2018:1660 - Security Advisory

Synopsis

Important: qemu-kvm security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

Security Fix(es):

  • An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)

Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation.

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

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

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.

Affected Products

  • Red Hat Enterprise Linux Server 6 x86_64
  • Red Hat Enterprise Linux Server 6 i386
  • Red Hat Enterprise Linux Workstation 6 x86_64
  • Red Hat Enterprise Linux Workstation 6 i386
  • Red Hat Enterprise Linux Desktop 6 x86_64
  • Red Hat Enterprise Linux Desktop 6 i386
  • Red Hat Enterprise Linux for Power, big endian 6 ppc64
  • Red Hat Enterprise Linux for Scientific Computing 6 x86_64

Fixes

  • BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass

CVEs

References

Red Hat Enterprise Linux Server 6

SRPM
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm SHA-256: d3364367735ec2d167cc10d6fe4b5adc92d3b06e13f10e20d843ece0e8166735
x86_64
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: ff46c7f93e9ce99bf0a5c4f80369ca73661ff9b4e36c107fe1fdf2d3901944df
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: 538f9c861e32f6d1f48dd4ccbc234358fdb6c52963572c6dadf2d86e19b8a807
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: c2d842c0de4c906ac7f5aa57ef861f5f580a38d179ed6c45c1f4620cc58d6894
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: bed09afa5a09507377d6bf7285bdee80699b554443e9aa5bb68f0eee228c9985
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: a2966ecd37605e93d9be105f33b4affb3428fdf8ec3d6888bfb70dc4812b3d2f
i386
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm SHA-256: 4cfdb9064711cd6be4a366a2b99af9cce8496e94dc000bd3a56885fcbc1bfbc8
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm SHA-256: 6fd3c9f86c5718460ddcebb89708f94c3174ef145fa709f6ea9e654a2271b818

Red Hat Enterprise Linux Workstation 6

SRPM
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm SHA-256: d3364367735ec2d167cc10d6fe4b5adc92d3b06e13f10e20d843ece0e8166735
x86_64
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: ff46c7f93e9ce99bf0a5c4f80369ca73661ff9b4e36c107fe1fdf2d3901944df
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: 538f9c861e32f6d1f48dd4ccbc234358fdb6c52963572c6dadf2d86e19b8a807
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: c2d842c0de4c906ac7f5aa57ef861f5f580a38d179ed6c45c1f4620cc58d6894
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: bed09afa5a09507377d6bf7285bdee80699b554443e9aa5bb68f0eee228c9985
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: a2966ecd37605e93d9be105f33b4affb3428fdf8ec3d6888bfb70dc4812b3d2f
i386
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm SHA-256: 4cfdb9064711cd6be4a366a2b99af9cce8496e94dc000bd3a56885fcbc1bfbc8
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm SHA-256: 6fd3c9f86c5718460ddcebb89708f94c3174ef145fa709f6ea9e654a2271b818

Red Hat Enterprise Linux Desktop 6

SRPM
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm SHA-256: d3364367735ec2d167cc10d6fe4b5adc92d3b06e13f10e20d843ece0e8166735
x86_64
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: ff46c7f93e9ce99bf0a5c4f80369ca73661ff9b4e36c107fe1fdf2d3901944df
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: 538f9c861e32f6d1f48dd4ccbc234358fdb6c52963572c6dadf2d86e19b8a807
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: c2d842c0de4c906ac7f5aa57ef861f5f580a38d179ed6c45c1f4620cc58d6894
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: bed09afa5a09507377d6bf7285bdee80699b554443e9aa5bb68f0eee228c9985
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: a2966ecd37605e93d9be105f33b4affb3428fdf8ec3d6888bfb70dc4812b3d2f
i386
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm SHA-256: 4cfdb9064711cd6be4a366a2b99af9cce8496e94dc000bd3a56885fcbc1bfbc8
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm SHA-256: 6fd3c9f86c5718460ddcebb89708f94c3174ef145fa709f6ea9e654a2271b818

Red Hat Enterprise Linux for Power, big endian 6

SRPM
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm SHA-256: d3364367735ec2d167cc10d6fe4b5adc92d3b06e13f10e20d843ece0e8166735
ppc64
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.ppc64.rpm SHA-256: 58b79862462d48c0cba45bc0169a0fb4f60fca9e47e2e0fbf9d235063caa1d39
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.ppc64.rpm SHA-256: ad0a78bde31d6180ed5cc9f7f611a67ffdc01060af3319801c854f18038a6eda

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm SHA-256: d3364367735ec2d167cc10d6fe4b5adc92d3b06e13f10e20d843ece0e8166735
x86_64
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: ff46c7f93e9ce99bf0a5c4f80369ca73661ff9b4e36c107fe1fdf2d3901944df
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: 538f9c861e32f6d1f48dd4ccbc234358fdb6c52963572c6dadf2d86e19b8a807
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: c2d842c0de4c906ac7f5aa57ef861f5f580a38d179ed6c45c1f4620cc58d6894
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: bed09afa5a09507377d6bf7285bdee80699b554443e9aa5bb68f0eee228c9985
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm SHA-256: a2966ecd37605e93d9be105f33b4affb3428fdf8ec3d6888bfb70dc4812b3d2f

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.