[RHSA-2017:0402-01] Important: kernel-rt security, bug fix, and enhancement update

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Red Hat Security Advisory

 

Synopsis: Important: kernel-rt security, bug fix, and enhancement update

Advisory ID: RHSA-2017:0402-01

Product: Red Hat Enterprise MRG for RHEL-6

Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0402.html

Issue date: 2017-03-02

CVE Names: CVE-2016-8655

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1. Summary:

 

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

 

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.

 

Security Fix(es):

 

* A race condition issue leading to a use-after-free flaw was found in the

way the raw packet sockets implementation in the Linux kernel networking

subsystem handled synchronization while creating the TPACKET_V3 ring

buffer. A local user able to open a raw packet socket (requires the

CAP_NET_RAW capability) could use this flaw to elevate their privileges on

the system. (CVE-2016-8655, Important)

 

Red Hat would like to thank Philip Pettersson for reporting this issue.

 

Enhancement(s):

 

* Previously, the Broadcom bnx2x driver in the MRG kernel-rt used an

incorrect PTP Hardware Clock (PHC) timer divisor value, which broke

Precision Time Protocol (PTP) timestamping due to an unstable clock. This

update corrects the divisor value, and the PTP timestamping is now

accurate, with monotonically increasing timestamp values. (BZ#1411139)

 

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/):

 

1400019 - CVE-2016-8655 kernel: Race condition in packet_set_ring leads to use after free

1414055 - update the MRG 2.5.z 3.10 kernel-rt sources

 

6. Package List:

 

MRG Realtime for RHEL 6 Server v.2:

 

Source:

kernel-rt-3.10.0-514.rt56.215.el6rt.src.rpm

 

noarch:

kernel-rt-doc-3.10.0-514.rt56.215.el6rt.noarch.rpm

kernel-rt-firmware-3.10.0-514.rt56.215.el6rt.noarch.rpm

 

x86_64:

kernel-rt-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-debug-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-debug-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-debug-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-trace-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-trace-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-trace-devel-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-vanilla-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.215.el6rt.x86_64.rpm

kernel-rt-vanilla-devel-3.10.0-514.rt56.215.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-2016-8655

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 2017 Red Hat, Inc.

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