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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) Intel/AMD/ARM CPU Cache Race Conditions Let Local Users Read Arbitrary Register and Memory Contents
SecurityTracker Alert ID:  1041423
SecurityTracker URL:
CVE Reference:   CVE-2018-3639   (Links to External Site)
Date:  Aug 6 2018
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in Intel, AMD, and ARM CPUs. A local user can obtain potentially sensitive information from system memory. Red Hat Enterprise Virtualization is affected.

A local user can exploit race conditions in CPU cache processing to obtain potentially sensitive information on the target system. This can be exploited to read arbitrary system register and memory contents on the target system.

A local user can conduct a side-channel attack to exploit a flaw in the speculative loading of system registers to read privileged system registers [CVE-2018-3640].

The CVE-2018-3640 vulnerability is referred to as "Spectre variant 3A".

A local user can conduct a side-channel attack to exploit a flaw in the speculative execution of Load and Store instructions to read privileged memory [CVE-2018-3639].

The CVE-2018-3639 vulnerability is referred to as "Spectre variant 4".

The original advisory is available at:

Zdenek Sojka, Rudolf Marek, and Alex Zuepke from SYSGO AG, Jann Horn (Google Project Zero), and Ken Johnson (Microsoft Security Response Center) reported these vulnerabilities.

Impact:   A local user can view system register or memory contents on the target CPU device.
Solution:   Red Hat has issued a fix for CVE-2018-3639 for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
May 22 2018 Intel/AMD/ARM CPU Cache Race Conditions Let Local Users Read Arbitrary Register and Memory Contents

 Source Message Contents

Subject:  [RHSA-2018:2328-01] Important: rhvm-setup-plugins security, bug fix, and enhancement update

Hash: SHA256

                   Red Hat Security Advisory

Synopsis:          Important: rhvm-setup-plugins security, bug fix, and enhancement update
Advisory ID:       RHSA-2018:2328-01
Product:           Red Hat Virtualization
Advisory URL:
Issue date:        2018-07-31
CVE Names:         CVE-2018-3639 

1. Summary:

An update for rhvm-setup-plugins is now available for Red Hat
Virtualization Engine 4.2.

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.

2. Relevant releases/architectures:

RHV-M 4.2 - noarch

3. Description:

The rhvm-setup-plugins package adds functionality exclusive only to Red Hat
Virtualization Manager, and is not available for the upstream ovirt-engine.
It includes the configuration of the Red Hat Support plugin, copying
downstream-only artifacts to the ISO domain, and links to the knowledgebase
and other support material.

The following packages have been upgraded to a later upstream version:
rhvm-setup-plugins (4.2.10). (BZ#1596152)

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, x86 AMD)

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

Bug Fix(es):

* This update adds support for IBM POWER9 hypervisors with RHEL-ALT and
POWER9 guests. It also adds support for POWER8 guests on a POWER9
hypervisor and live migration of POWER8 guests between POWER8 and POWER9
hypervisors. (BZ#1592320)

4. Solution:

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

5. Bugs fixed (

1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
1592320 - [downstream clone - 4.2.5] add POWER 9 to the 4.2 cluster level

6. Package List:

RHV-M 4.2:



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>. More contact
details at

Copyright 2018 Red Hat, Inc.
Version: GnuPG v1


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