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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: kernel security and bug fix update
Advisory ID:       RHSA-2013:1860-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-1860.html
Issue date:        2013-12-19
CVE Names:         CVE-2013-4299 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 5.9 Extended Update Support.

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:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

* An information leak flaw was found in the way the Linux kernel's device
mapper subsystem, under certain conditions, interpreted data written to
snapshot block devices. An attacker could use this flaw to read data from
disk blocks in free space, which are normally inaccessible. (CVE-2013-4299,
Moderate)

Red Hat would like to thank Fujitsu for reporting this issue.

This update also fixes the following bugs:

* A previous fix to the kernel did not contain a memory barrier in the
percpu_up_write() function. Consequently, under certain circumstances, a
race condition could occur, leading to memory corruption and a subsequent
kernel panic. This update introduces a new memory barrier pair, light_mb()
and heavy_mb(), for per-CPU basis read and write semaphores
(percpu-rw-semaphores) ensuring that the race condition can no longer
occur. In addition, the read path performance of "percpu-rw-semaphores" has
been improved. (BZ#884735)

* Due to several related bugs in the be2net driver, the driver did not
handle firmware manipulation of the network cards using the Emulex XE201
I/O controller properly. As a consequence, these NICs could not recover
from an error successfully. A series of patches has been applied that fix
the initialization sequence, and firmware download and activation for the
XE201 controller. Error recovery now works as expected for the be2net NICs
using the Emulex XE201 I/O controller. (BZ#1019892)

* A bug in the be2net driver could cause packet corruption when handling
VLAN-tagged packets with no assigned VLAN group. This happened because the
be2net driver called a function responsible for VLAN tag reinsertion in a
wrong order in the code. The code has been restructured and the be2net
driver now calls the __vlan_put_tag() function correctly, thus avoiding the
packet corruption. (BZ#1019893)

* A previous patch to the kernel introduced the "VLAN tag re-insertion"
workaround to resolve a problem with incorrectly handled VLAN-tagged
packets with no assigned VLAN group while the be2net driver was in
promiscuous mode. However, this solution led to packet corruption and a
subsequent kernel oops if such a processed packet was a GRO packet.
Therefore, a patch has been applied to restrict VLAN tag re-insertion only
to non-GRO packets. The be2net driver now processes VLAN-tagged packets
with no assigned VLAN group correctly in this situation. (BZ#1023347)

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4. 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/site/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 (https://bugzilla.redhat.com/):

1004233 - CVE-2013-4299 kernel: dm: dm-snapshot data leak

6. Package List:

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kernel-2.6.18-348.21.1.el5.src.rpm

i386:
kernel-2.6.18-348.21.1.el5.i686.rpm
kernel-PAE-2.6.18-348.21.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-348.21.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-348.21.1.el5.i686.rpm
kernel-debug-2.6.18-348.21.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-348.21.1.el5.i686.rpm
kernel-debug-devel-2.6.18-348.21.1.el5.i686.rpm
kernel-debuginfo-2.6.18-348.21.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-348.21.1.el5.i686.rpm
kernel-devel-2.6.18-348.21.1.el5.i686.rpm
kernel-headers-2.6.18-348.21.1.el5.i386.rpm
kernel-xen-2.6.18-348.21.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-348.21.1.el5.i686.rpm
kernel-xen-devel-2.6.18-348.21.1.el5.i686.rpm

ia64:
kernel-2.6.18-348.21.1.el5.ia64.rpm
kernel-debug-2.6.18-348.21.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-348.21.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-348.21.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-348.21.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-348.21.1.el5.ia64.rpm
kernel-devel-2.6.18-348.21.1.el5.ia64.rpm
kernel-headers-2.6.18-348.21.1.el5.ia64.rpm
kernel-xen-2.6.18-348.21.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-348.21.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-348.21.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-348.21.1.el5.noarch.rpm

ppc:
kernel-2.6.18-348.21.1.el5.ppc64.rpm
kernel-debug-2.6.18-348.21.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-348.21.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-348.21.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-348.21.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-348.21.1.el5.ppc64.rpm
kernel-devel-2.6.18-348.21.1.el5.ppc64.rpm
kernel-headers-2.6.18-348.21.1.el5.ppc.rpm
kernel-headers-2.6.18-348.21.1.el5.ppc64.rpm
kernel-kdump-2.6.18-348.21.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-348.21.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-348.21.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-348.21.1.el5.s390x.rpm
kernel-debug-2.6.18-348.21.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-348.21.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-348.21.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-348.21.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-348.21.1.el5.s390x.rpm
kernel-devel-2.6.18-348.21.1.el5.s390x.rpm
kernel-headers-2.6.18-348.21.1.el5.s390x.rpm
kernel-kdump-2.6.18-348.21.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-348.21.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-348.21.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-348.21.1.el5.x86_64.rpm
kernel-debug-2.6.18-348.21.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-348.21.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-348.21.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-348.21.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-348.21.1.el5.x86_64.rpm
kernel-devel-2.6.18-348.21.1.el5.x86_64.rpm
kernel-headers-2.6.18-348.21.1.el5.x86_64.rpm
kernel-xen-2.6.18-348.21.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-348.21.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-348.21.1.el5.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-2013-4299.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.
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