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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:2216-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2216
Issue date: 2018-07-17
CVE Names: CVE-2018-3639
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.2
Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP
Solutions.

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:

Red Hat Enterprise Linux Server AUS (v. 7.2) – noarch, x86_64
Red Hat Enterprise Linux Server E4S (v. 7.2) – noarch, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.2) – x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.2) – ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.2) – x86_64
Red Hat Enterprise Linux Server TUS (v. 7.2) – noarch, x86_64

3. Description:

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

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):

* When switching from the indirect branch speculation (IBRS) feature to the
retpolines feature, the IBRS state of some CPUs was sometimes not handled
correctly. Consequently, some CPUs were left with the IBRS Model-Specific
Register (MSR) bit set to 1, which could lead to performance issues. With
this update, the underlying source code has been fixed to clear the IBRS
MSR bits correctly, thus fixing the bug. (BZ#1586145)

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/):

1566890 – CVE-2018-3639 hw: cpu: speculative store bypass

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.2):

Source:
kernel-3.10.0-327.71.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.71.1.el7.noarch.rpm
kernel-doc-3.10.0-327.71.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.71.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.71.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.71.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.71.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.71.1.el7.x86_64.rpm
perf-3.10.0-327.71.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
python-perf-3.10.0-327.71.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.2):

Source:
kernel-3.10.0-327.71.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.71.1.el7.noarch.rpm
kernel-doc-3.10.0-327.71.1.el7.noarch.rpm

ppc64le:
kernel-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debug-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-devel-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-headers-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-tools-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-327.71.1.el7.ppc64le.rpm
perf-3.10.0-327.71.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
python-perf-3.10.0-327.71.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm

Red Hat Enterprise Linux Server TUS (v. 7.2):

Source:
kernel-3.10.0-327.71.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.71.1.el7.noarch.rpm
kernel-doc-3.10.0-327.71.1.el7.noarch.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.2):

x86_64:
kernel-debug-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.71.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.71.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.71.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.2):

ppc64le:
kernel-debug-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-327.71.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.71.1.el7.ppc64le.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.2):

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-2018-3639
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/ssbd

8. Contact:

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

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