Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel-rt packages that fix two security issues and several bugs
are now available for Red Hat Enterprise MRG 2.5.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

• It was found that the Linux kernel's Infiniband subsystem did not
  properly sanitize input parameters while registering memory regions from
  user space via the (u)verbs API. A local user with access to a
  /dev/infiniband/uverbsX device could use this flaw to crash the system or,
  potentially, escalate their privileges on the system. (CVE-2014-8159,
  Important)
  
• A use-after-free flaw was found in the way the Linux kernel's SCTP
  implementation handled authentication key reference counting during INIT
  collisions. A remote attacker could use this flaw to crash the system or,
  potentially, escalate their privileges on the system. (CVE-2015-1421,
  Important)
  

Red Hat would like to thank Mellanox for reporting the CVE-2014-8159 issue.
The CVE-2015-1421 issue was discovered by Sun Baoliang of Red Hat.

The MRG-Realtime 3.10 kernel-rt sources have been updated to include the
following bug fixes:

• The kdump service could become unresponsive due to a deadlock in the
  kernel call ioapic_lock.
  
• Attempt to make metadata changes such as creating a thin device or
  snapshot thin device did not error out cleanly.
  

(BZ#1201384)

This update also fixes the following bug:

• The MRG kernel scheduler code was missing checks for the PREEMPT_LAZY
  flag allowing tasks to be preempted more times than necessary causing
  latency spikes on the system. Additional checks for the PREEMPT_LAZY flag
  were added to the check_preempt_wakeup() and check_preempt_curr() functions
  in the scheduler code so that preempt wakeups were reduced and these
  latency spikes were removed. (BZ#1157949)
  

All kernel-rt users are advised to upgrade to these updated packages, which
correct these issues. The system must be rebooted for this update to take
effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 1181166 - CVE-2014-8159 kernel: infiniband: uverbs: unprotected physical memory access
• BZ - 1196581 - CVE-2015-1421 kernel: net: slab corruption from use after free on INIT collisions
• BZ - 1201384 - RFE: rebase the 3.10 kernel-rt

CVEs

• CVE-2014-8159
• CVE-2015-1421

References

• https://access.redhat.com/security/updates/classification/#important

MRG Realtime 2

SRPM
kernel-rt-3.10.0-229.rt56.147.el6rt.src.rpm	SHA-256: cb94b96cf46435fb41e325629263d80511d8c5cf33470093fd9cc71899f67639
x86_64
kernel-rt-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 739f191e265d3557fd92cb00d57ebee20b9727b5eb09e4a550a6611e38f6489e
kernel-rt-debug-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 8d14c452b28dba832256373ab72bd16f2c45fdee7adf13d52a6812831be8b90b
kernel-rt-debug-debuginfo-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 7c5470c1ba94287aa517f6db76fc015db7a00ad8aea619d186089e113903681b
kernel-rt-debug-devel-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 064c94beaea2c7070fbb708b589a02fa699ed238c127117f74153c0f93ea2e9c
kernel-rt-debuginfo-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 15dd98664134d4164c67dabff117cda0d8fc642afc612eaab8a9bc0e6d66f2d4
kernel-rt-debuginfo-common-x86_64-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: ed55deb5b3b5fa340bf9c886c6e64f8a88491f35007246becd756dca203e716b
kernel-rt-devel-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 5c6ec87a0bb74c08adc3a5b9aede8c4057f55457ab845921497776d8f0986b0c
kernel-rt-doc-3.10.0-229.rt56.147.el6rt.noarch.rpm	SHA-256: 2f876e04890f53c083beb690653c83c552fcdba06b7ca746a76a1db22418b701
kernel-rt-firmware-3.10.0-229.rt56.147.el6rt.noarch.rpm	SHA-256: 2dab5283a99161658263d8366d47f147fa5de0e945c4cc843855a98e86c6e6e0
kernel-rt-trace-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 3a5d3189bd55895d14ac61663a0d1a51a088dc50ff8886dd59240e170bb4f130
kernel-rt-trace-debuginfo-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 39304ab2e8183d6cf3b3dcf6f0a91f4d373b18e45108c4019bb53b3b44761d9e
kernel-rt-trace-devel-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 9fda429eee2f2192359ef48681f40de60b9a3678489711c0eac7adfa4eb81a01
kernel-rt-vanilla-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: aae26a1c836fccc1bc7bbabc60eebafaecda42d447cd2648f453a096f531ebd8
kernel-rt-vanilla-debuginfo-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: c000411206fe80a2d04c23d7d81f01e918cc005a512c7d2fd09bad4d053a2364
kernel-rt-vanilla-devel-3.10.0-229.rt56.147.el6rt.x86_64.rpm	SHA-256: 780250263ad753cd753f2e93d4c98d0a3874339e0f6dc972efa54ace2ea90a4b