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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2018:2763-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2763
Issue date:        2018-09-25
CVE Names:         CVE-2018-14634 
=====================================================================

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):

* kernel: Integer overflow in Linux's create_elf_tables function
(CVE-2018-14634)

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 Qualys Research Labs for reporting this issue.

Bug Fix(es):

* The kernel-rt packages have been upgraded to the 3.10.0-862.14.3 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1616429)

* Previously, preemption was enabled too early after a context switch. If a
task was migrated to another CPU after a context switch, a mismatch between
CPU and runqueue during load balancing sometimes occurred. Consequently, a
runnable task on an idle CPU failed to run, and the operating system became
unresponsive. This update disables preemption in the schedule_tail()
function. As a result, CPU migration during post-schedule processing no
longer occurs, which prevents the above mismatch. The operating system no
longer hangs due to this bug. (BZ#1617941)

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/):

1616429 - kernel-rt: update to the RHEL7.5.z batch#4 source tree
1617941 - RT system hang due to wrong of rq's nr_running [rhel-7.5.z]
1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's
 create_elf_tables function

6. Package List:

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

Source:
kernel-rt-3.10.0-862.14.4.rt56.821.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.14.4.rt56.821.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-862.14.4.rt56.821.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.14.4.rt56.821.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.14.4.rt56.821.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-2018-14634
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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