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Red Hat: RHSA-2017:0402-01 Important Race Condition Security Fix

red hat
Calendar Grey March 2, 2017
Scroller Redhat
Kernel-rt significant enhancement resolving a concurrency issue vulnerability and improving PTP timestamping capabilities for Red Hat MRG 2.
An update for kernel-rt is now available for Red Hat Enterprise MRG 2

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.

Summary

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)

Topics%20covered

Topics Covered

security advisory Red Hat bug fix important race condition kernel-rt RHEL-6

References

https://access.redhat.com/security/cve/CVE-2016-8655 https://access.redhat.com/security/updates/classification/#important

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/


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2017:0402-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0402.html
Issue date: 2017-03-02

Topic

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 impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat bug fix important race condition kernel-rt RHEL-6

Relevant Releases Architectures

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

Bugs Fixed

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

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