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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) Intel CPUs Let Local Users Obtain or Infer Portions of L1 Cache Memory on the Target System
SecurityTracker Alert ID:  1041486
SecurityTracker URL:
CVE Reference:   CVE-2018-3620, CVE-2018-3646   (Links to External Site)
Date:  Aug 15 2018
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Intel CPUs. A local user can obtain potentially sensitive information from system memory. Red Hat Enterprise Virtualization is affected.

A local user can conduct a speculative execution side-channel attack against the L1 cache to infer potentially sensitive information from L1 cache memory on the target system.

This method is referred to as the "L1 Terminal Fault (L1TF)" or "Foreshadow" attack.

Microprocessors that support Intel Software Guard Extensions (SGX) are affected [CVE-2018-3615].

Other Intel microprocessors that use speculative execution and address translations may be affected [CVE-2018-3620].

Other Intel microprocessors that use speculative execution and address translations and that host virtual systems may be affected [CVE-2018-3646].

The following models are affected:

Core i3 processor (45nm and 32nm)
Core i5 processor (45nm and 32nm)
Core i7 processor (45nm and 32nm)
Core M processor family (45nm and 32nm)
2nd generation Core processors
3rd generation Core processors
4th generation Core processors
5th generation Core processors
6th generation Core processors
7th generation Core processors
8th generation Core processors
Core X-series Processor Family for X99 platforms
Core X-series Processor Family for X299 platforms
Xeon processor 3400 series
Xeon processor 3600 series
Xeon processor 5500 series
Xeon processor 5600 series
Xeon processor 6500 series
Xeon processor 7500 series
Xeon Processor E3 Family
Xeon Processor E3 v2 Family
Xeon Processor E3 v3 Family
Xeon Processor E3 v4 Family
Xeon Processor E3 v5 Family
Xeon Processor E3 v6 Family
Xeon Processor E5 Family
Xeon Processor E5 v2 Family
Xeon Processor E5 v3 Family
Xeon Processor E5 v4 Family
Xeon Processor E7 Family
Xeon Processor E7 v2 Family
Xeon Processor E7 v3 Family
Xeon Processor E7 v4 Family
Xeon Processor Scalable Family
Xeon Processor D (1500, 2100)

The original advisory is available at:

Raoul Strackx, Jo Van Bulck, and Frank Piessens of imec-DistriNet, KU Leuven, Marina Minkin and Mark Silberstein of Technion, Ofir Weisse, Daniel Genkin, Baris Kasikci, and Thomas F. Wenisch of University of Michigan, and Yuval Yarom of University of Adelaide and Data61 reported this vulnerability.

Impact:   A local user can obtain potentially sensitive information from L1 cache memory on the target system.
Solution:   Red Hat has issued a fix for CVE-2018-3620 and CVE-2018-3646 for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Aug 14 2018 Intel CPUs Let Local Users Obtain or Infer Portions of L1 Cache Memory on the Target System

 Source Message Contents

Subject:  [RHSA-2018:2404-01] Important: rhev-hypervisor7 security update

Hash: SHA256

                   Red Hat Security Advisory

Synopsis:          Important: rhev-hypervisor7 security update
Advisory ID:       RHSA-2018:2404-01
Product:           Red Hat Virtualization
Advisory URL:
Issue date:        2018-08-15
CVE Names:         CVE-2018-3620 CVE-2018-3646 

1. Summary:

An update for rhev-hypervisor7 is now available for RHEV 3.X Hypervisor and
Agents for Red Hat Enterprise Linux 6 and RHEV 3.X Hypervisor and Agents
Extended Lifecycle Support for Red Hat Enterprise Linux 7.

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:

RHEL 7-based RHEV-H ELS - noarch
RHEV Hypervisor for RHEL-6 ELS - noarch

3. Description:

The rhev-hypervisor7 package provides a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor
is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes
everything necessary to run and manage virtual machines: A subset of the
Red Hat Enterprise Linux operating environment and the Red Hat Enterprise
Virtualization Agent.

Security Fix(es):

* Modern operating systems implement virtualization of physical memory to
efficiently use available system resources and provide inter-domain
protection through access control and isolation. The L1TF issue was found
in the way the x86 microprocessor designs have implemented speculative
execution of instructions (a commonly used performance optimisation) in
combination with handling of page-faults caused by terminated virtual to
physical address resolving process. As a result, an unprivileged attacker
could use this flaw to read privileged memory of the kernel or other
processes and/or cross guest/host boundaries to read host memory by
conducting targeted cache side-channel attacks. (CVE-2018-3620,

Red Hat would like to thank Intel OSSIRT ( for reporting these

4. Solution:

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

5. Bugs fixed (

1585005 - CVE-2018-3646 CVE-2018-3620 Kernel: hw: cpu: L1 terminal fault (L1TF)
1614065 - [Tracker] Tracking bug for RHEV-H 3.6.13 respin

6. Package List:

RHEV Hypervisor for RHEL-6 ELS:



RHEL 7-based RHEV-H ELS:



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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