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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2019:0188-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:0188
Issue date:        2019-01-29
CVE Names:         CVE-2018-18559 
=====================================================================

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: Use-after-free due to race condition in AF_PACKET implementation
(CVE-2018-18559)

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.

Bug Fix(es):

* The kernel-rt packages have been upgraded to the 3.10.0-957.5.1 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1653822)

* Under certain circumstances, the following warning message, which
indicated a SCHED_DEADLINE bandwidth tracking mechanism error, occurred:  

WARNING: CPU: 8 PID: 19536 at kernel/sched/deadline.c:64
dequeue_task_dl+0x121/0x140

This update fixes the sched_setscheduler() core kernel function, and
backports multiple upstream patches to the SCHED_DEADLINE scheduler. As a
result, the SCHED_DEADLINE bandwidth tracking mechanism is prevented from
error conditions, and the warning message no longer occurs. (BZ#1655439)

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/):

1641878 - CVE-2018-18559 kernel: Use-after-free due to race condition in
 AF_PACKET implementation

6. Package List:

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

Source:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-957.5.1.rt56.916.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-957.5.1.rt56.916.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.5.1.rt56.916.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-2018-18559
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 2019 Red Hat, Inc.
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