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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2018:1642-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1642
Issue date:        2018-05-21
CVE Names:         CVE-2018-3639 
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise MRG 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:

Red Hat MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

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)

Note: This issue is present in hardware and cannot be fully fixed via
software update. The updated kernel packages provide software side of the
mitigation for this hardware issue. To be fully functional, up-to-date CPU
microcode applied on the system is required. Please refer to References
section for further information about this issue, CPU microcode
requirements and the potential performance impact.

Red Hat would like to thank Ken Johnson (Microsoft Security Response
Center) and Jann Horn (Google Project Zero) 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/):

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

6. Package List:

Red Hat MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.0-693.25.7.rt56.615.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.25.7.rt56.615.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-693.25.7.rt56.615.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-693.25.7.rt56.615.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-693.25.7.rt56.615.el6rt.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-2018-3639
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/

Copyright 2018 Red Hat, Inc.
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