RHEL 6 : kernel-rt (RHSA-2015:0751)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

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.

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2014-8159.html
https://www.redhat.com/security/data/cve/CVE-2015-1421.html
http://rhn.redhat.com/errata/RHSA-2015-0751.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 82467 ()

Bugtraq ID:

CVE ID: CVE-2014-8159
CVE-2015-1421

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