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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2015:1030-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1030.html
Issue date:        2015-05-27
CVE Names:         CVE-2015-1421 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and three bugs are now
available for Red Hat Enterprise Linux 6.4 Advanced Update Support.

Red Hat Product Security has rated this update as having Important 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 Server AUS (v. 6.4) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - i386, ppc64, s390x, x86_64

3. Description:

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

* A use-after-free flaw was found in the way the Linux kernel's SCTP
implementation handled authentication key reference counting during INIT
collisions. A remote attacker could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2015-1421,
Important)

This issue was discovered by Sun Baoliang of Red Hat.

This update also fixes the following bugs:

* When ARP is disabled on an interface with an ARP entry for a neighbor
host present in the ARP cache, letting the cached entry expire and
attempting to communicate with that neighbor host could cause the host MAC
address to not be resolved correctly after ARP is enabled again on the
interface. With the following workaround, the entry is not expired and the
described scenario works correctly:

1) Add the maximum number of ARP entries you expect for your configuration
to the proc/sys/net/ipv4/neigh/default/gc_thresh file.

2) Ensure that relevant IP addresses are put in the ARP cache when the
system boots, for example by executing the following two commands:

ping [IP address] -c 1
ifconfig ethX -arp

(BZ#1207350)

* Previously, the open() system call in some cases failed with an EBUSY
error if the opened file was also being renamed at the same time. With this
update, the kernel automatically retries open() when this failure occurs,
and if the retry is not successful either, open() now fails with an ESTALE
error. (BZ#1207813)

* Previously, a race condition occurred in the build_id_cache__add_s()
function, which could truncate system files. A patch has been provided to
fix this bug, and system files are no longer truncated in the
aforementioned scenario. (BZ#1210591)

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.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1196581 - CVE-2015-1421 kernel: net: slab corruption from use after free on INIT collisions

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.4):

Source:
kernel-2.6.32-358.61.1.el6.src.rpm

i386:
kernel-2.6.32-358.61.1.el6.i686.rpm
kernel-debug-2.6.32-358.61.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-358.61.1.el6.i686.rpm
kernel-debug-devel-2.6.32-358.61.1.el6.i686.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-358.61.1.el6.i686.rpm
kernel-devel-2.6.32-358.61.1.el6.i686.rpm
kernel-headers-2.6.32-358.61.1.el6.i686.rpm
perf-2.6.32-358.61.1.el6.i686.rpm
perf-debuginfo-2.6.32-358.61.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-358.61.1.el6.noarch.rpm
kernel-firmware-2.6.32-358.61.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-358.61.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debug-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-358.61.1.el6.ppc64.rpm
kernel-devel-2.6.32-358.61.1.el6.ppc64.rpm
kernel-headers-2.6.32-358.61.1.el6.ppc64.rpm
perf-2.6.32-358.61.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-358.61.1.el6.s390x.rpm
kernel-debug-2.6.32-358.61.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-358.61.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-358.61.1.el6.s390x.rpm
kernel-devel-2.6.32-358.61.1.el6.s390x.rpm
kernel-headers-2.6.32-358.61.1.el6.s390x.rpm
kernel-kdump-2.6.32-358.61.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-358.61.1.el6.s390x.rpm
perf-2.6.32-358.61.1.el6.s390x.rpm
perf-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debug-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.61.1.el6.x86_64.rpm
kernel-devel-2.6.32-358.61.1.el6.x86_64.rpm
kernel-headers-2.6.32-358.61.1.el6.x86_64.rpm
perf-2.6.32-358.61.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.4):

Source:
kernel-2.6.32-358.61.1.el6.src.rpm

i386:
kernel-debug-debuginfo-2.6.32-358.61.1.el6.i686.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-358.61.1.el6.i686.rpm
perf-debuginfo-2.6.32-358.61.1.el6.i686.rpm
python-perf-2.6.32-358.61.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-358.61.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm
python-perf-2.6.32-358.61.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-358.61.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
perf-debuginfo-2.6.32-358.61.1.el6.s390x.rpm
python-perf-2.6.32-358.61.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-358.61.1.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.61.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.61.1.el6.x86_64.rpm
python-perf-2.6.32-358.61.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.61.1.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/

7. References:

https://access.redhat.com/security/cve/CVE-2015-1421
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 2015 Red Hat, Inc.
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