RHSA-2012:1282 - Security Advisory

Topic

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.

Description

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.

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/knowledge/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.

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 725799 - diskless support for MRG 2.x
• BZ - 786083 - iptables unable to log to rsyslog
• BZ - 798421 - Rebase MRG RT kernel to 3.2-rtX series
• BZ - 798423 - InfiniBand stack refresh in MRG RT
• BZ - 799385 - Thread can dead lock in migrate timers
• BZ - 799386 - The futex proxy handler grabs the pi_lock without disabling interrupts
• BZ - 799389 - lglocks can be taken and never released on cpu offline and onlining
• BZ - 799391 - Tasks waiting on a state change of another task may get wrong result
• BZ - 799399 - ftrace_dump() can cause issues on RT
• BZ - 814689 - missing /proc/sys/crypto/fips_enabled in 3.2.14-rt24.22.el6rt.x86_64 causes openssh errors
• BZ - 815937 - 3.0.25-rt44.57.el6rt.x86_64 missing firmware rtl_nic/rtl8168e-2.fw
• BZ - 825344 - new mrg-rt-release sub-package [mrg2.2]
• BZ - 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"
• BZ - 842680 - kernel 3.2.23-rt37.49.el6rt.x86_64 doesn't create symlinks to /lib/firmware/mrg-rt-firmware
• BZ - 853474 - CVE-2012-4398 kernel: request_module() OOM local DoS

CVEs

• CVE-2012-4398

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_MRG/2/html/Technical_Notes/sec-Red_Hat_Enterprise_Linux_6.html#RHSA-2012-1282