U radu jezgre opracijskog sustava uočena su dva propusta koje napadači mogu iskoristiti za DoS (eng. Denial f Service, DoS) napad.

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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2012:1129-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1129.html
Issue date:        2012-07-31
CVE Names:         CVE-2011-1083 CVE-2012-2744 
=====================================================================

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
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 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:

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

This update fixes the following security issues:

* A NULL pointer dereference flaw was found in the nf_ct_frag6_reasm()
function in the Linux kernel's netfilter IPv6 connection tracking
implementation. A remote attacker could use this flaw to send
specially-crafted packets to a target system that is using IPv6 and also
has the nf_conntrack_ipv6 kernel module loaded, causing it to crash.
(CVE-2012-2744, Important)

* A flaw was found in the way the Linux kernel's Event Poll (epoll)
subsystem handled large, nested epoll structures. A local, unprivileged
user could use this flaw to cause a denial of service. (CVE-2011-1083,
Moderate)

Red Hat would like to thank an anonymous contributor working with the
Beyond Security SecuriTeam Secure Disclosure program for reporting
CVE-2012-2744, and Nelson Elhage for reporting CVE-2011-1083.

This update also fixes the following bugs:

* Attempting to turn on Data Center Bridging (DCB) on a port connected to a
non-DCB switch port caused the system to become unresponsive or even
terminate. This was because napi_poll routines in the ixgbe driver did not
end the NAPI when data processing was complete. With this update, the ixgbe
napi_poll routines have been fixed so that they now call the
napi_complete() function when data processing has finished. This ensures
that the NAPI is correctly disabled, and thus prevents possible hangs and
crashes in this scenario. (BZ#814454)

* If a new file was created on a Network File System version 4 (NFSv4)
share, the ownership was set to nfsnobody (-2) until it was possible to
upcall to the idmapper. As a consequence, subsequent file system operations
could incorrectly use "-2" for the user and group IDs for the given file,
causing certain operations to fail. In reported cases, this issue also
caused "Viminfo file is not writable" errors for users running Vim with
files on an NFSv4 share. (BZ#820962)

* Previously, the size of the multicast IGMP (Internet Group Management
Protocol) snooping hash table for a bridge was limited to 256 entries even
though the maximum is 512. This was due to the hash table size being
incorrectly compared to the maximum hash table size, hash_max, and the
following message could have been produced by the kernel:

    Multicast hash table maximum reached, disabling snooping: vnet1, 512

With this update, the hash table value is correctly compared to the
hash_max value, and the error message no longer occurs under these
circumstances. (BZ#840021)

Users should upgrade to these updated packages, which contain backported
patches to resolve 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/):

681578 - CVE-2011-1083 kernel: excessive in kernel CPU consumption when creating
large nested epoll structures
833402 - CVE-2012-2744 kernel: netfilter: null pointer dereference in
nf_ct_frag6_reasm()

6. Package List:

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

Source:
kernel-2.6.32-220.24.1.el6.src.rpm

i386:
kernel-2.6.32-220.24.1.el6.i686.rpm
kernel-debug-2.6.32-220.24.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-220.24.1.el6.i686.rpm
kernel-debug-devel-2.6.32-220.24.1.el6.i686.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-220.24.1.el6.i686.rpm
kernel-devel-2.6.32-220.24.1.el6.i686.rpm
kernel-headers-2.6.32-220.24.1.el6.i686.rpm
perf-2.6.32-220.24.1.el6.i686.rpm
perf-debuginfo-2.6.32-220.24.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-220.24.1.el6.noarch.rpm
kernel-firmware-2.6.32-220.24.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-220.24.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debug-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-220.24.1.el6.ppc64.rpm
kernel-devel-2.6.32-220.24.1.el6.ppc64.rpm
kernel-headers-2.6.32-220.24.1.el6.ppc64.rpm
perf-2.6.32-220.24.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-220.24.1.el6.s390x.rpm
kernel-debug-2.6.32-220.24.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-220.24.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-220.24.1.el6.s390x.rpm
kernel-devel-2.6.32-220.24.1.el6.s390x.rpm
kernel-headers-2.6.32-220.24.1.el6.s390x.rpm
kernel-kdump-2.6.32-220.24.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-220.24.1.el6.s390x.rpm
perf-2.6.32-220.24.1.el6.s390x.rpm
perf-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debug-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.24.1.el6.x86_64.rpm
kernel-devel-2.6.32-220.24.1.el6.x86_64.rpm
kernel-headers-2.6.32-220.24.1.el6.x86_64.rpm
perf-2.6.32-220.24.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-220.24.1.el6.src.rpm

i386:
kernel-debug-debuginfo-2.6.32-220.24.1.el6.i686.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-220.24.1.el6.i686.rpm
perf-debuginfo-2.6.32-220.24.1.el6.i686.rpm
python-perf-2.6.32-220.24.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-220.24.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm
python-perf-2.6.32-220.24.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-220.24.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
perf-debuginfo-2.6.32-220.24.1.el6.s390x.rpm
python-perf-2.6.32-220.24.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-220.24.1.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.24.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.24.1.el6.x86_64.rpm
python-perf-2.6.32-220.24.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.24.1.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-2011-1083.html
https://www.redhat.com/security/data/cve/CVE-2012-2744.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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