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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2014:0593-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-0593.html
Issue date: 2014-06-03
CVE Names: CVE-2014-0077 CVE-2014-2523
=====================================================================

1. Summary:

Updated kernel packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 6.3 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 Compute Node EUS (v. 6.3) – noarch, x86_64
Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.3) – x86_64
Red Hat Enterprise Linux Server EUS (v. 6.3) – i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.3) – i386, ppc64, s390x, x86_64

3. Description:

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

* A flaw was found in the way the Linux kernel’s netfilter connection
tracking implementation for Datagram Congestion Control Protocol (DCCP)
packets used the skb_header_pointer() function. A remote attacker could use
this flaw to send a specially crafted DCCP packet to crash the system or,
potentially, escalate their privileges on the system. (CVE-2014-2523,
Important)

* A flaw was found in the way the handle_rx() function handled large
network packets when mergeable buffers were disabled. A privileged guest
user could use this flaw to crash the host or corrupt QEMU process memory
on the host, which could potentially result in arbitrary code execution on
the host with the privileges of the QEMU process. (CVE-2014-0077, Moderate)

The CVE-2014-0077 issue was discovered by Michael S. Tsirkin of Red Hat.

This update also fixes the following bug:

* Prior to this update, a guest-provided value was used as the head length
of the socket buffer allocated on the host. If the host was under heavy
memory load and the guest-provided value was too large, the allocation
could have failed, resulting in stalls and packet drops in the guest’s Tx
path. With this update, the guest-provided value has been limited to a
reasonable size so that socket buffer allocations on the host succeed
regardless of the memory load on the host, and guests can send packets
without experiencing packet drops or stalls. (BZ#1092350)

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/):

1064440 – CVE-2014-0077 kernel: vhost-net: insufficiency in handling of big packets in handle_rx()
1077343 – CVE-2014-2523 kernel: netfilter: nf_conntrack_dccp: incorrect skb_header_pointer API usages

6. Package List:

Red Hat Enterprise Linux Compute Node EUS (v. 6.3):

Source:
kernel-2.6.32-279.46.1.el6.src.rpm

noarch:
kernel-doc-2.6.32-279.46.1.el6.noarch.rpm
kernel-firmware-2.6.32-279.46.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debug-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-279.46.1.el6.x86_64.rpm
kernel-devel-2.6.32-279.46.1.el6.x86_64.rpm
kernel-headers-2.6.32-279.46.1.el6.x86_64.rpm
perf-2.6.32-279.46.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm

Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.3):

Source:
kernel-2.6.32-279.46.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-279.46.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm
python-perf-2.6.32-279.46.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.3):

Source:
kernel-2.6.32-279.46.1.el6.src.rpm

i386:
kernel-2.6.32-279.46.1.el6.i686.rpm
kernel-debug-2.6.32-279.46.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-279.46.1.el6.i686.rpm
kernel-debug-devel-2.6.32-279.46.1.el6.i686.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-279.46.1.el6.i686.rpm
kernel-devel-2.6.32-279.46.1.el6.i686.rpm
kernel-headers-2.6.32-279.46.1.el6.i686.rpm
perf-2.6.32-279.46.1.el6.i686.rpm
perf-debuginfo-2.6.32-279.46.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-279.46.1.el6.noarch.rpm
kernel-firmware-2.6.32-279.46.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-279.46.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debug-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-279.46.1.el6.ppc64.rpm
kernel-devel-2.6.32-279.46.1.el6.ppc64.rpm
kernel-headers-2.6.32-279.46.1.el6.ppc64.rpm
perf-2.6.32-279.46.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-279.46.1.el6.s390x.rpm
kernel-debug-2.6.32-279.46.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-279.46.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-279.46.1.el6.s390x.rpm
kernel-devel-2.6.32-279.46.1.el6.s390x.rpm
kernel-headers-2.6.32-279.46.1.el6.s390x.rpm
kernel-kdump-2.6.32-279.46.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-279.46.1.el6.s390x.rpm
perf-2.6.32-279.46.1.el6.s390x.rpm
perf-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.s390x.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.3):

Source:
kernel-2.6.32-279.46.1.el6.src.rpm

i386:
kernel-debug-debuginfo-2.6.32-279.46.1.el6.i686.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-279.46.1.el6.i686.rpm
perf-debuginfo-2.6.32-279.46.1.el6.i686.rpm
python-perf-2.6.32-279.46.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-279.46.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm
python-perf-2.6.32-279.46.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-279.46.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
perf-debuginfo-2.6.32-279.46.1.el6.s390x.rpm
python-perf-2.6.32-279.46.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-279.46.1.el6.s390x.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-2014-0077.html
https://www.redhat.com/security/data/cve/CVE-2014-2523.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/

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