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 ELS.

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 instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation 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 cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks. (CVE-2017-5715)
  

Note: This is the qemu-kvm-rhev side of the CVE-2017-5715 mitigation.

Red Hat would like to thank 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 - 1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection

CVEs

(none)

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/speculativeexecution
• https://access.redhat.com/security/cve/CVE-2017-5715

Red Hat Virtualization - ELS 3

SRPM
qemu-kvm-rhev-2.6.0-28.el7_3.15.src.rpm	SHA-256: 7de913dbe2639d8849baf6588ec1a7c737a6f626cb8f15d3d218401078d0f998
x86_64
qemu-img-rhev-2.6.0-28.el7_3.15.x86_64.rpm	SHA-256: 1803ae94ec2bf50aa2c04cdc4fb64572d5b1bba4d69afd9414015d5a5b83ee50
qemu-kvm-common-rhev-2.6.0-28.el7_3.15.x86_64.rpm	SHA-256: 67ac8a5df4c341a2fb8beb556138f8d0c7a006bf39443b45925757761fa93392
qemu-kvm-rhev-2.6.0-28.el7_3.15.x86_64.rpm	SHA-256: e5617ff860dc48879021e1740e1cc8622bfee673fa605e083c9bc8903eece696
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.15.x86_64.rpm	SHA-256: dde46767ba2038ffc09ef9aa957ec40e8a69e6a3efa6ff41e6886937247c11d1
qemu-kvm-tools-rhev-2.6.0-28.el7_3.15.x86_64.rpm	SHA-256: d5aaeefa714d4003c335ade85501ef115344b9d5171bbb7ff7efe7cec647d4f1