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Red Hat Security Advisory
Synopsis: Moderate: kernel-rt security and bug fix update
Advisory ID: RHSA-2010:0771-01
Product: Red Hat Enterprise MRG for RHEL-5
Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0771.html
Issue date: 2010-10-14
CVE Names: CVE-2010-0307 CVE-2010-2942 CVE-2010-2955
Updated kernel-rt packages that fix multiple security issues and upgrade
the kernel-rt kernel to version 220.127.116.11-rt29 are now available for Red Hat
Enterprise MRG 1.3.
The Red Hat Security Response Team has rated this update as having moderate
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.
2. Relevant releases/architectures:
MRG Realtime for RHEL 5 Server - i386, noarch, x86_64
The kernel-rt packages contain the Linux kernel, the core of any Linux
This update fixes the following security issues:
* On AMD64 systems, it was discovered that the kernel did not ensure the
ELF interpreter was available before making a call to the SET_PERSONALITY
macro. A local attacker could use this flaw to cause a denial of service by
running a 32-bit application that attempts to execute a 64-bit application.
* Information leak flaws were found in the Linux kernel Traffic Control
Unit implementation. A local attacker could use these flaws to cause the
kernel to leak kernel memory to user-space, possibly leading to the
disclosure of sensitive information. (CVE-2010-2942, Moderate)
* It was found that wireless drivers might not always clear allocated
buffers when handling a driver-specific IOCTL information request. A local
user could trigger this flaw to cause kernel memory to leak from the heap
to user-space, leading to an information leak. (CVE-2010-2955, Moderate)
* A flaw was found in the eql_g_master_cfg() function in the Linux kernel
equalizer load-balancer for serial network interfaces implementation. A
data structure in eql_g_master_cfg() was not initialized properly before
being copied to user-space. A local, unprivileged user could use this flaw
to cause an information leak. (CVE-2010-3297, Moderate)
Red Hat would like to thank Mathias Krause for reporting CVE-2010-0307, and
Dan Rosenberg for reporting CVE-2010-3297.
This update also fixes the following bugs:
* The mkinitrd utility reported the following warning message when creating
an initial ramdisk:
No module dm-mem-cache found for kernel [version], aborting.
This was caused by an erroneous dependency on dmraid-related modules. This
update removes these dependencies with the result that mkinitrd does not
issue a spurious warning about the dm-mem-cache module not being found.
* The ibm_rtl kernel module now performs more exhaustive checking to ensure
it only loads on correct IBM hardware. (BZ#612275)
* The realtime Linux kernel has been upgraded to upstream version
18.104.22.168-rt29, which provides a number of bug fixes and enhancements for
Red Hat Enterprise MRG 1.3. (BZ#638672)
Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version 22.214.171.124-rt29 to correct these issues. 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/):
482753 - mkinitrd erroneously inserts dependencies to dm-mem-cache (not present on MRG)
560547 - CVE-2010-0307 kernel: DoS on x86_64
612275 - WARNING: at arch/x86/mm/ioremap.c:148 __ioremap_caller+0x160/0x30e()
624903 - CVE-2010-2942 kernel: net sched: fix some kernel memory leaks
628434 - CVE-2010-2955 kernel: wireless: fix 64K kernel heap content leak via ioctl
633145 - CVE-2010-3297 kernel: drivers/net/eql.c: reading uninitialized stack memory
638672 - Need to move the MRG RT source base to upstream RT (2.6.33)
6. Package List:
MRG Realtime for RHEL 5 Server:
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://www.redhat.com/security/team/contact/
Copyright 2010 Red Hat, Inc.
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