Synopsis

Important: qemu-kvm-rhev security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform 8.0 (Liberty).

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-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 OpenStack 8 x86_64

Fixes

• BZ - 1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection
• BZ - 1525505 - QEMU's AIO subsystem gets stuck inhibiting all I/O operations on virtio-blk-pci devices [OSP 8]

CVEs

(none)

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/speculativeexecution
• https://access.redhat.com/solutions/3307851
• https://access.redhat.com/security/cve/CVE-2017-5715

Red Hat OpenStack 8

SRPM
qemu-kvm-rhev-2.9.0-16.el7_4.13.src.rpm	SHA-256: 73a76469d8bca0d2c69f61bf2b16aac013b1252c15e5e71397472c5151ac477e
x86_64
qemu-img-rhev-2.9.0-16.el7_4.13.x86_64.rpm	SHA-256: 5c38d89c080d40962b2d151c8e35ad5c61e663b097c7fb3f9dac97581c071b64
qemu-kvm-common-rhev-2.9.0-16.el7_4.13.x86_64.rpm	SHA-256: fdd54fa5b7baa7288a78334068e98d79dccf830685c08472de49104bff8c547b
qemu-kvm-rhev-2.9.0-16.el7_4.13.x86_64.rpm	SHA-256: db991d442f842ebcd436db20afbd42904b0e6fb6fe2a5bb9a26ee8d128ee04c8
qemu-kvm-rhev-debuginfo-2.9.0-16.el7_4.13.x86_64.rpm	SHA-256: e6985a1e76b05669e318355b30fc8566181a70ab774ee2cacf387caf679e6e46
qemu-kvm-tools-rhev-2.9.0-16.el7_4.13.x86_64.rpm	SHA-256: dbab6c1e756b053a599c33f1eb47e7724c258214f655a8e27c9bddabbf200345