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Red Hat: Security update for the Linux kernel

The kernel packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way socket buffers (skb) requiring TSO (TCP segment offloading) were handled by the sfc driver. If the skb did not fit within the minimum-size of the transmission queue, the network card could repeatedly reset itself. A remote attacker could use this flaw to cause a denial of service.

A buffer overflow flaw was found in the hfs_bnode_read() function in the HFS Plus (HFS+) file system implementation. A local user able to mount a specially-crafted HFS+ file system image could use this flaw to cause a denial of service or escalate their privileges.

Updated packages are available from ftp.redhat.com.

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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2012:1347-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1347.html
Issue date:        2012-10-09
CVE Names:         CVE-2012-2319 CVE-2012-3412 
=====================================================================

1. Summary:

Updated kernel packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 5.6 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
important 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 EUS (v. 5.6 server) - i386, ia64, noarch, ppc, s390x, x86_64

3. Description:

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

This update fixes the following security issues:

* A flaw was found in the way socket buffers (skb) requiring TSO (TCP
segment offloading) were handled by the sfc driver. If the skb did not fit
within the minimum-size of the transmission queue, the network card could
repeatedly reset itself. A remote attacker could use this flaw to cause a
denial of service. (CVE-2012-3412, Important)

* A buffer overflow flaw was found in the hfs_bnode_read() function in the
HFS Plus (HFS+) file system implementation in the Linux kernel. A local
user able to mount a specially-crafted HFS+ file system image could use
this flaw to cause a denial of service or escalate their privileges.
(CVE-2012-2319, Low)

Red Hat would like to thank Ben Hutchings of Solarflare (tm) for reporting
CVE-2012-3412.

This update also fixes the following bug:

* Some subsystems clear the TIF_SIGPENDING flag during error handling in
fork() paths. Previously, if the flag was cleared, the ERESTARTNOINTR error
code could be returned. The underlying source code has been modified so
that the error code is no longer returned. (BZ#855754)

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.

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/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/):

819471 - CVE-2012-2319 kernel: Buffer overflow in the HFS plus filesystem (different issue than CVE-2009-4020)
844714 - CVE-2012-3412 kernel: sfc: potential remote denial of service through TCP MSS option

6. Package List:

Red Hat Enterprise Linux EUS (v. 5.6 server):

Source:
kernel-2.6.18-238.45.1.el5.src.rpm

i386:
kernel-2.6.18-238.45.1.el5.i686.rpm
kernel-PAE-2.6.18-238.45.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-238.45.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-238.45.1.el5.i686.rpm
kernel-debug-2.6.18-238.45.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-238.45.1.el5.i686.rpm
kernel-debug-devel-2.6.18-238.45.1.el5.i686.rpm
kernel-debuginfo-2.6.18-238.45.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-238.45.1.el5.i686.rpm
kernel-devel-2.6.18-238.45.1.el5.i686.rpm
kernel-headers-2.6.18-238.45.1.el5.i386.rpm
kernel-xen-2.6.18-238.45.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-238.45.1.el5.i686.rpm
kernel-xen-devel-2.6.18-238.45.1.el5.i686.rpm

ia64:
kernel-2.6.18-238.45.1.el5.ia64.rpm
kernel-debug-2.6.18-238.45.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-238.45.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-238.45.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-238.45.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-238.45.1.el5.ia64.rpm
kernel-devel-2.6.18-238.45.1.el5.ia64.rpm
kernel-headers-2.6.18-238.45.1.el5.ia64.rpm
kernel-xen-2.6.18-238.45.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-238.45.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-238.45.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-238.45.1.el5.noarch.rpm

ppc:
kernel-2.6.18-238.45.1.el5.ppc64.rpm
kernel-debug-2.6.18-238.45.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-238.45.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-238.45.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-238.45.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-238.45.1.el5.ppc64.rpm
kernel-devel-2.6.18-238.45.1.el5.ppc64.rpm
kernel-headers-2.6.18-238.45.1.el5.ppc.rpm
kernel-headers-2.6.18-238.45.1.el5.ppc64.rpm
kernel-kdump-2.6.18-238.45.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-238.45.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-238.45.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-238.45.1.el5.s390x.rpm
kernel-debug-2.6.18-238.45.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-238.45.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-238.45.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-238.45.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-238.45.1.el5.s390x.rpm
kernel-devel-2.6.18-238.45.1.el5.s390x.rpm
kernel-headers-2.6.18-238.45.1.el5.s390x.rpm
kernel-kdump-2.6.18-238.45.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-238.45.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-238.45.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-238.45.1.el5.x86_64.rpm
kernel-debug-2.6.18-238.45.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-238.45.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-238.45.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-238.45.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-238.45.1.el5.x86_64.rpm
kernel-devel-2.6.18-238.45.1.el5.x86_64.rpm
kernel-headers-2.6.18-238.45.1.el5.x86_64.rpm
kernel-xen-2.6.18-238.45.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-238.45.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-238.45.1.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-2012-2319.html
https://www.redhat.com/security/data/cve/CVE-2012-3412.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2012 Red Hat, Inc.
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