Synopsis

Important: qemu-kvm-rhev security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm-rhev is now available for RHEV 3.X Hypervisor and Agents for Red Hat Enterprise Linux 7 Extended Life 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

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

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-rhev 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 Virtualization - ELS 3 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 Virtualization - ELS 3

SRPM
qemu-kvm-rhev-2.6.0-28.el7_3.17.src.rpm	SHA-256: dbea5461db8dda1313380278a7e7df4c27cc0f64109f408e0e76721ece25b918
x86_64
qemu-img-rhev-2.6.0-28.el7_3.17.x86_64.rpm	SHA-256: 754d3681e352ed53cda93e548fa6c6f7e067740a76f265eb820804ac39443412
qemu-kvm-common-rhev-2.6.0-28.el7_3.17.x86_64.rpm	SHA-256: 72eb9dcd70facf04a5b9e4a43056e176fe4e644aa12aa8951d9aca138418563c
qemu-kvm-rhev-2.6.0-28.el7_3.17.x86_64.rpm	SHA-256: 8a4e6aabd814eb21fec315868fdc70fd04adb447e49856dc7ee460c5edc2d3f9
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.17.x86_64.rpm	SHA-256: ad58bf3c4945a8d09f50a929dadafa18a3fa9a5a0ff3aa9af840d4d7de78e08e
qemu-kvm-tools-rhev-2.6.0-28.el7_3.17.x86_64.rpm	SHA-256: 5061b6626151c8c906ad64d8a44b49624c23a373d35628608c05aff8111e5b81