[RHSA-2016:1631-01] Important: realtime-kernel security and bug fix update

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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

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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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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