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

Synopsis:          Important: realtime-kernel security and bug fix update
Advisory ID:       RHSA-2016:1631-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-1631.html
Issue date:        2016-08-18
CVE Names:         CVE-2016-5696 
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.

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:

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.

It was found that the RFC 5961 challenge ACK rate limiting as implemented 
in the Linux kernel's networking subsystem allowed an off-path attacker to 
leak certain information about a given connection by creating congestion on
the global challenge ACK rate limit counter and then measuring the changes 
by probing packets. An off-path attacker could use this flaw to either 
terminate TCP connection and/or inject payload into non-secured TCP 
connection between two endpoints on the network. (CVE-2016-5696, Important)

Red Hat would like to thank Yue Cao from Cyber Security Group in the CS
department of University of California, Riverside, 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/):

1354708 - CVE-2016-5696 kernel: challenge ACK counter information disclosure.

6. Package List:

MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.0-327.rt56.195.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.0-327.rt56.195.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-327.rt56.195.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.195.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-327.rt56.195.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-2016-5696
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 2016 Red Hat, Inc.
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