[RHSA-2012:1541-01] Moderate: kernel security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Moderate: kernel security and bug fix update

Advisory ID: RHSA-2012:1541-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1541.html

Issue date: 2012-12-04

CVE Names: CVE-2011-4131 CVE-2012-2313

=====================================================================

 

1. Summary:

 

Updated kernel packages that fix two security issues and several bugs are

now available for Red Hat Enterprise Linux 6.2 Extended Update Support.

 

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:

 

Red Hat Enterprise Linux Server EUS (v. 6.2) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 6.2) - i386, ppc64, s390x, x86_64

 

3. Description:

 

These packages contain the Linux kernel.

 

Security fixes:

 

* A malicious NFSv4 server could return a crafted reply to a GETACL

request, causing a denial of service on the client. (CVE-2011-4131,

Moderate)

 

* A flaw in the dl2k driver could allow a local, unprivileged user to issue

potentially harmful IOCTLs, possibly causing Ethernet adapters using the

driver to malfunction (such as losing network connectivity).

(CVE-2012-2313, Low)

 

Red Hat would like to thank Andy Adamson for reporting CVE-2011-4131, and

Stephan Mueller for reporting CVE-2012-2313.

 

Bug fixes:

 

* A kernel oops occurred in the nf_nat code when a bogus pointer was

dereferenced in the nf_conn_nat structure. Consequently, if Source Network

Address Translation (SNAT) was performed, incorrect information could be

received by other CTS (Clear to Send) signals. A conntrack entry is now

placed in the source hash after SNAT has been completed, which prevents the

described problems. (BZ#865715)

 

* Previously, the ixgbe_setup_tc() function was called recursively when the

set_state() CEE (Convergence Enhanced Ethernet) API routine was called in

IEEE DCBX (Data Center Bridging eXchange) mode. This is considered unsafe

according to the IEEE standards. With this update, the ixgbe driver has

been modified to no longer call the set_state() routine in IEEE DCBX mode.

The driver now calls routines of the PFC (Priority-based Flow Control) and

ETS (Enhanced Transmission Selection) extensions instead of the CEE

extension routines in IEEE DCBX mode. (BZ#867859)

 

* A Symmetric Multi Processing (SMP) race condition between the munmap()

and exit() function could lead to false-positive triggering of the BUG_ON()

macro if Transparent Huge Pages (THP) were enabled. This update fixes the

race condition, which avoids false-positive triggering of the BUG_ON()

macro in this scenario. (BZ#875121)

 

* The kernel allows high priority real time tasks, such as tasks scheduled

with the SCHED_FIFO policy, to be throttled. Previously, the CPU stop tasks

were scheduled as high priority real time tasks and could be thus throttled

accordingly. However, the replenishment timer, which is responsible for

clearing a throttle flag on tasks, could be pending on the just disabled

CPU. This could lead to the situation that the throttled tasks were never

scheduled to run. Consequently, if any of such tasks was needed to complete

the CPU disabling, the system became unresponsive. This update introduces a

new scheduler class, which gives a task the highest possible system

priority and such a task cannot be throttled. The stop-task scheduling

class is now used for the CPU stop tasks, and the system shutdown completes

as expected in the scenario described. (BZ#876078)

 

* Previously, XFS log buffers were handled incorrectly so that XFS could,

in certain circumstances, incorrectly read metadata from the journal during

XFS log recovery. As a consequence, XFS log recovery terminated with an

error message and prevented the file system from being mounted. This

problem could result in a loss of data if the user forcibly emptied the log

to allow the file system to be mounted. This update ensures that metadata

is read correctly from the log and journal recovery thus completes

successfully, and the file system mounts as expected. (BZ#876498)

 

* Previously, kernel was allowed to reduce the number of unnecessary commit

calls by skipping the commit when there was a large number of outstanding

pages being written. However, a test on the number of commits (ncommit) did

not properly handle the edge case when ncommit was zero. Consequently,

inodes sometimes remained on the sb->s_dirty list and could not be freed by

the inode cache shrinker. As a result, the nfs_inode_cache structure grew

very large over time. With this update, the call to the nfs_write_inode()

function is immediately returned when commit == 0, thus fixing this bug.

(BZ#877394)

 

4. Solution:

 

Users should upgrade to these updated packages, which contain backported

patches 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

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.

 

5. Bugs fixed (http://bugzilla.redhat.com/):

 

747106 - CVE-2011-4131 kernel: nfs4_getfacl decoding kernel oops

818820 - CVE-2012-2313 kernel: unfiltered netdev rio_ioctl access by users

 

6. Package List:

 

Red Hat Enterprise Linux Server EUS (v. 6.2):

 

Source:

kernel-2.6.32-220.30.1.el6.src.rpm

 

i386:

kernel-2.6.32-220.30.1.el6.i686.rpm

kernel-debug-2.6.32-220.30.1.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-220.30.1.el6.i686.rpm

kernel-debug-devel-2.6.32-220.30.1.el6.i686.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-220.30.1.el6.i686.rpm

kernel-devel-2.6.32-220.30.1.el6.i686.rpm

kernel-headers-2.6.32-220.30.1.el6.i686.rpm

perf-2.6.32-220.30.1.el6.i686.rpm

perf-debuginfo-2.6.32-220.30.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.i686.rpm

 

noarch:

kernel-doc-2.6.32-220.30.1.el6.noarch.rpm

kernel-firmware-2.6.32-220.30.1.el6.noarch.rpm

 

ppc64:

kernel-2.6.32-220.30.1.el6.ppc64.rpm

kernel-bootwrapper-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debug-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debug-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debug-devel-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-220.30.1.el6.ppc64.rpm

kernel-devel-2.6.32-220.30.1.el6.ppc64.rpm

kernel-headers-2.6.32-220.30.1.el6.ppc64.rpm

perf-2.6.32-220.30.1.el6.ppc64.rpm

perf-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

 

s390x:

kernel-2.6.32-220.30.1.el6.s390x.rpm

kernel-debug-2.6.32-220.30.1.el6.s390x.rpm

kernel-debug-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

kernel-debug-devel-2.6.32-220.30.1.el6.s390x.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-220.30.1.el6.s390x.rpm

kernel-devel-2.6.32-220.30.1.el6.s390x.rpm

kernel-headers-2.6.32-220.30.1.el6.s390x.rpm

kernel-kdump-2.6.32-220.30.1.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

kernel-kdump-devel-2.6.32-220.30.1.el6.s390x.rpm

perf-2.6.32-220.30.1.el6.s390x.rpm

perf-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

 

x86_64:

kernel-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debug-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debug-devel-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-220.30.1.el6.x86_64.rpm

kernel-devel-2.6.32-220.30.1.el6.x86_64.rpm

kernel-headers-2.6.32-220.30.1.el6.x86_64.rpm

perf-2.6.32-220.30.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional EUS (v. 6.2):

 

Source:

kernel-2.6.32-220.30.1.el6.src.rpm

 

i386:

kernel-debug-debuginfo-2.6.32-220.30.1.el6.i686.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-220.30.1.el6.i686.rpm

perf-debuginfo-2.6.32-220.30.1.el6.i686.rpm

python-perf-2.6.32-220.30.1.el6.i686.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.i686.rpm

 

ppc64:

kernel-debug-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-220.30.1.el6.ppc64.rpm

perf-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

python-perf-2.6.32-220.30.1.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.ppc64.rpm

 

s390x:

kernel-debug-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-220.30.1.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

perf-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

python-perf-2.6.32-220.30.1.el6.s390x.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.s390x.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-220.30.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-220.30.1.el6.x86_64.rpm

python-perf-2.6.32-220.30.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-220.30.1.el6.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

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2011-4131.html

https://www.redhat.com/security/data/cve/CVE-2012-2313.html

https://access.redhat.com/security/updates/classification/#moderate

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2012 Red Hat, Inc.

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