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AUSCERT External Security Bulletin Redistribution
Moderate: kernel-rt security, bug fix, and enhancement update
20 September 2012
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2012-4398
Comment: This advisory references vulnerabilities in the Linux kernel that
also affect distributions other than Red Hat. It is recommended that
administrators running Linux check for an updated version of the
kernel for their system.
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Red Hat Security Advisory
Synopsis: Moderate: kernel-rt security, bug fix, and enhancement update
Advisory ID: RHSA-2012:1282-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1282.html
Issue date: 2012-09-19
CVE Names: CVE-2012-4398
Updated kernel-rt packages that fix one security issue, several bugs, and
add enhancements are now available for Red Hat Enterprise MRG 2.2.
The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.
2. Relevant releases/architectures:
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
The kernel-rt packages contain the Linux kernel, the core of any Linux
This update fixes the following security issue:
* It was found that a deadlock could occur in the Out of Memory (OOM)
killer. A process could trigger this deadlock by consuming a large amount
of memory, and then causing request_module() to be called. A local,
unprivileged user could use this flaw to cause a denial of service
(excessive memory consumption). (CVE-2012-4398, Moderate)
Red Hat would like to thank Tetsuo Handa for reporting this issue.
The kernel-rt packages have been upgraded to upstream version 3.2, which
provides a number of bug fixes and enhancements over the previous version.
This update also fixes various bugs and adds enhancements. Documentation
for these changes will be available shortly from the Technical Notes
document linked to in the References section.
Users should upgrade to these updated kernel-rt packages, which correct
this issue, fix these bugs, and add these enhancements. The system must
be rebooted for this update to take effect.
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.
5. Bugs fixed (http://bugzilla.redhat.com/):
725799 - diskless support for MRG 2.x
786083 - iptables unable to log to rsyslog
798421 - Rebase MRG RT kernel to 3.2-rtX series
798423 - InfiniBand stack refresh in MRG RT
799385 - Thread can dead lock in migrate timers
799386 - The futex proxy handler grabs the pi_lock without disabling interrupts
799389 - lglocks can be taken and never released on cpu offline and onlining
799391 - Tasks waiting on a state change of another task may get wrong result
799399 - ftrace_dump() can cause issues on RT
814689 - missing /proc/sys/crypto/fips_enabled in 3.2.14-rt24.22.el6rt.x86_64 causes openssh errors
815937 - 3.0.25-rt44.57.el6rt.x86_64 missing firmware rtl_nic/rtl8168e-2.fw
825344 - new mrg-rt-release sub-package [mrg2.2]
834583 - kernel-rt-3.2.20-rt32.44.el6rt.x86_64 floods the console with "DMAR [fault reason 02] Present bit in context entry is clear"
842680 - kernel 3.2.23-rt37.49.el6rt.x86_64 doesn't create symlinks to /lib/firmware/mrg-rt-firmware
853474 - CVE-2012-4398 kernel: request_module() OOM local DoS
6. Package List:
MRG Realtime for RHEL 6 Server v.2:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2012 Red Hat, Inc.
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