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Red Hat 2.2 RHSA-2012:1282-01 Moderate: kernel-rt DoS Fix

red hat
Calendar Grey September 19, 2012
Scroller Redhat
The latest kernel-rt updates for Red Hat address a DoS vulnerability, resolve multiple bugs, and enhance overall system efficiency.
Updated kernel-rt packages that fix one security issue, several bugs, and add enhancements are now available for Red Hat Enterprise MRG 2.2

Solution

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

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.

Summary

The kernel-rt packages contain the Linux kernel, the core of any Linux operating system.
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. (BZ#798421)
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.

Topics%20covered

Topics Covered

security advisory Red Hat DoS issue bug fix moderate severity kernel-rt enhancement update

References

https://access.redhat.com/security/cve/CVE-2012-4398 https://access.redhat.com/security/updates/classification#moderate

Package List

MRG Realtime for RHEL 6 Server v.2:
Source:
noarch: kernel-rt-doc-3.2.23-rt37.56.el6rt.noarch.rpm kernel-rt-firmware-3.2.23-rt37.56.el6rt.noarch.rpm mrg-rt-release-3.2.23-rt37.56.el6rt.noarch.rpm rt-firmware-1.0-3.el6_3.noarch.rpm
x86_64: kernel-rt-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-debug-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-debug-devel-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-debuginfo-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-devel-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-trace-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-trace-devel-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-vanilla-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.2.23-rt37.56.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.2.23-rt37.56.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#package


Advisory ID: RHSA-2012:1282-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://access.redhat.com/errata/RHSA-2012:1282.html
Issue date: 2012-09-19

Topic

Updated kernel-rt packages that fix one security issue, several bugs, andadd enhancements are now available for Red Hat Enterprise MRG 2.2.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory Red Hat DoS issue bug fix moderate severity kernel-rt enhancement update

Relevant Releases Architectures

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

Bugs Fixed

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 timers799386 - 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 errors815937 - 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

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