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 6.7 Extended Update Support.

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 - Extended Update Support 6.7 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 6.7 i386
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7 ppc64
• Red Hat Enterprise Linux EUS Compute Node 6.7 x86_64
• RHEL for SAP HANA - Extended Update Support 6.7 x86_64

Fixes

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

CVEs

• CVE-2018-3639

References

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

Red Hat Enterprise Linux Server - Extended Update Support 6.7

SRPM
qemu-kvm-0.12.1.2-2.479.el6_7.7.src.rpm	SHA-256: a6b362c92ce1e2bf961be9613acab67d1f3db482f14e326cfb27aec95d267cf8
x86_64
qemu-guest-agent-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: be125bc9612e799cc9d47483c5c2a49599ce40fdc2d87a82401576fd80f9b468
qemu-img-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: 051623e20a4f98853f97e027a3d00a0fede72bab1be171abde5e1726de341f18
qemu-kvm-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: ab03872f5ae3ed6dfda8d69fc4431522f011692c847b1edf628b9586a5ed38ec
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: c6c07fc53197c2e9389756e87beffd6012a46aea6efc54c585219c553f71e134
qemu-kvm-tools-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: e322617c75285c168fe063de162a0fcacf0f546827db2eef83e47a3b2b31e1fb
i386
qemu-guest-agent-0.12.1.2-2.479.el6_7.7.i686.rpm	SHA-256: 3b105ce91bc65ae721d689c67056d45e262e65c6466487983f364cd868e2d10f
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.7.i686.rpm	SHA-256: 47ff0e2f0924e3fe70ac546109db3523aa73c838078011c47bd3048999705316

Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.7

SRPM
qemu-kvm-0.12.1.2-2.479.el6_7.7.src.rpm	SHA-256: a6b362c92ce1e2bf961be9613acab67d1f3db482f14e326cfb27aec95d267cf8
ppc64
qemu-guest-agent-0.12.1.2-2.479.el6_7.7.ppc64.rpm	SHA-256: d64c78b8828f0307a5a7d8a26ec8ae2d4cfcd372ad3962df959f52f9d9c29300
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.7.ppc64.rpm	SHA-256: bff50f1dbf8bca5597983bf9ac438f817616c32069c89372f08875604205dfed

Red Hat Enterprise Linux EUS Compute Node 6.7

SRPM
qemu-kvm-0.12.1.2-2.479.el6_7.7.src.rpm	SHA-256: a6b362c92ce1e2bf961be9613acab67d1f3db482f14e326cfb27aec95d267cf8
x86_64
qemu-guest-agent-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: be125bc9612e799cc9d47483c5c2a49599ce40fdc2d87a82401576fd80f9b468
qemu-img-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: 051623e20a4f98853f97e027a3d00a0fede72bab1be171abde5e1726de341f18
qemu-kvm-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: ab03872f5ae3ed6dfda8d69fc4431522f011692c847b1edf628b9586a5ed38ec
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: c6c07fc53197c2e9389756e87beffd6012a46aea6efc54c585219c553f71e134
qemu-kvm-tools-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: e322617c75285c168fe063de162a0fcacf0f546827db2eef83e47a3b2b31e1fb

RHEL for SAP HANA - Extended Update Support 6.7

SRPM
qemu-kvm-0.12.1.2-2.479.el6_7.7.src.rpm	SHA-256: a6b362c92ce1e2bf961be9613acab67d1f3db482f14e326cfb27aec95d267cf8
x86_64
qemu-guest-agent-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: be125bc9612e799cc9d47483c5c2a49599ce40fdc2d87a82401576fd80f9b468
qemu-img-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: 051623e20a4f98853f97e027a3d00a0fede72bab1be171abde5e1726de341f18
qemu-kvm-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: ab03872f5ae3ed6dfda8d69fc4431522f011692c847b1edf628b9586a5ed38ec
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: c6c07fc53197c2e9389756e87beffd6012a46aea6efc54c585219c553f71e134
qemu-kvm-tools-0.12.1.2-2.479.el6_7.7.x86_64.rpm	SHA-256: e322617c75285c168fe063de162a0fcacf0f546827db2eef83e47a3b2b31e1fb