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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel 'Lazy FPU Restore' Lets Local Users Obtain Potentially Sensitive FPU State Information on the Target System
SecurityTracker Alert ID:  1041136
SecurityTracker URL:  http://securitytracker.com/id/1041136
CVE Reference:   CVE-2018-3665   (Links to External Site)
Date:  Jun 15 2018
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 7
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain potentially sensitive information.

A local user can conduct cache side-channel attacks to exploit a flaw in the 'Lazy Floating Point Unit (FPU)' scheme where the kernel saves and restores FPU state during task switching to potentially determine FPU state bits.

Julian Stecklina (Amazon.de), Thomas Prescher (cyberus-technology.de), Zdenek Sojka (sysgo.com), and Colin Percival reported this vulnerability.

Impact:   A local user can obtain potentially sensitive FPU state information on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:1852

Vendor URL:  access.redhat.com/errata/RHSA-2018:1852 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 14 2018 Linux Kernel 'Lazy FPU Restore' Lets Local Users Obtain Potentially Sensitive FPU State Information on the Target System



 Source Message Contents

Subject:  [RHSA-2018:1852-01] Moderate: kernel security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: kernel security update
Advisory ID:       RHSA-2018:1852-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1852
Issue date:        2018-06-14
CVE Names:         CVE-2018-3665 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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:

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - noarch, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - noarch, ppc64le

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* Kernel: FPU state information leakage via lazy FPU restore
(CVE-2018-3665)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Julian Stecklina (Amazon.de), Thomas Prescher
(cyberus-technology.de), and Zdenek Sojka (sysgo.com) for reporting this
issue.

4. 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

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1585011 - CVE-2018-3665 Kernel: FPU state information leakage via lazy FPU restore

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
kernel-3.10.0-862.3.3.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-862.3.3.el7.noarch.rpm
kernel-doc-3.10.0-862.3.3.el7.noarch.rpm

x86_64:
kernel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-headers-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.x86_64.rpm
perf-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
kernel-3.10.0-862.3.3.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-862.3.3.el7.noarch.rpm
kernel-doc-3.10.0-862.3.3.el7.noarch.rpm

x86_64:
kernel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-headers-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.x86_64.rpm
perf-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-862.3.3.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-862.3.3.el7.noarch.rpm
kernel-doc-3.10.0-862.3.3.el7.noarch.rpm

ppc64:
kernel-3.10.0-862.3.3.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debug-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-862.3.3.el7.ppc64.rpm
kernel-devel-3.10.0-862.3.3.el7.ppc64.rpm
kernel-headers-3.10.0-862.3.3.el7.ppc64.rpm
kernel-tools-3.10.0-862.3.3.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.ppc64.rpm
perf-3.10.0-862.3.3.el7.ppc64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
python-perf-3.10.0-862.3.3.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debug-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-devel-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-headers-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.ppc64le.rpm
perf-3.10.0-862.3.3.el7.ppc64le.rpm
perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
python-perf-3.10.0-862.3.3.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm

s390x:
kernel-3.10.0-862.3.3.el7.s390x.rpm
kernel-debug-3.10.0-862.3.3.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.s390x.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-862.3.3.el7.s390x.rpm
kernel-devel-3.10.0-862.3.3.el7.s390x.rpm
kernel-headers-3.10.0-862.3.3.el7.s390x.rpm
kernel-kdump-3.10.0-862.3.3.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
kernel-kdump-devel-3.10.0-862.3.3.el7.s390x.rpm
perf-3.10.0-862.3.3.el7.s390x.rpm
perf-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
python-perf-3.10.0-862.3.3.el7.s390x.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.s390x.rpm

x86_64:
kernel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-headers-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.x86_64.rpm
perf-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

noarch:
kernel-abi-whitelists-3.10.0-862.3.3.el7.noarch.rpm
kernel-doc-3.10.0-862.3.3.el7.noarch.rpm

ppc64le:
kernel-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debug-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-devel-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-headers-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.ppc64le.rpm
perf-3.10.0-862.3.3.el7.ppc64le.rpm
perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
python-perf-3.10.0-862.3.3.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm

s390x:
kernel-3.10.0-862.3.3.el7.s390x.rpm
kernel-debug-3.10.0-862.3.3.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.s390x.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-862.3.3.el7.s390x.rpm
kernel-devel-3.10.0-862.3.3.el7.s390x.rpm
kernel-headers-3.10.0-862.3.3.el7.s390x.rpm
kernel-kdump-3.10.0-862.3.3.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
kernel-kdump-devel-3.10.0-862.3.3.el7.s390x.rpm
perf-3.10.0-862.3.3.el7.s390x.rpm
perf-debuginfo-3.10.0-862.3.3.el7.s390x.rpm
python-perf-3.10.0-862.3.3.el7.s390x.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-862.3.3.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.ppc64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.ppc64le.rpm
perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

noarch:
kernel-doc-3.10.0-862.3.3.el7.noarch.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.ppc64le.rpm
perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
kernel-3.10.0-862.3.3.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-862.3.3.el7.noarch.rpm
kernel-doc-3.10.0-862.3.3.el7.noarch.rpm

x86_64:
kernel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debug-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-devel-3.10.0-862.3.3.el7.x86_64.rpm
kernel-headers-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-3.10.0-862.3.3.el7.x86_64.rpm
perf-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-862.3.3.el7.x86_64.rpm
perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-862.3.3.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-3665
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/solutions/3485131

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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