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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2018:2003-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2003
Issue date:        2018-06-26
CVE Names:         CVE-2017-11600 CVE-2018-3639 
=====================================================================

1. Summary:

An update for kernel-rt is now available 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:

Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - 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, x86 AMD)

* kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message
(CVE-2017-11600)

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 Ken Johnson (Microsoft Security Response
Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639.

Bug Fix(es):

* The kernel-rt packages have been upgraded to the 3.10.0-862.6.1 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1576058)

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/):

1474928 - CVE-2017-11600 kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message
1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
1576058 - kernel-rt: update to the RHEL7.5.z batch#2 source tree

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-862.6.3.rt56.811.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.6.3.rt56.811.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-862.6.3.rt56.811.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.6.3.rt56.811.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.6.3.rt56.811.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.6.3.rt56.811.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-2017-11600
https://access.redhat.com/security/cve/CVE-2018-3639
https://access.redhat.com/security/updates/classification/#important

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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