Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel packages that fix two security issues and one bug 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.

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 processed an authenticated
  COOKIE_ECHO chunk during the initialization of an SCTP connection. A remote
  attacker could use this flaw to crash the system by initiating a specially
  crafted SCTP handshake in order to trigger a NULL pointer dereference on
  the system. (CVE-2014-0101, Important)
  
• A race condition flaw, leading to heap-based buffer overflows, was found
  in the way the Linux kernel's N_TTY line discipline (LDISC) implementation
  handled concurrent processing of echo output and TTY write operations
  originating from user space when the underlying TTY driver was PTY.
  An unprivileged, local user could use this flaw to crash the system or,
  potentially, escalate their privileges on the system. (CVE-2014-0196,
  Important)
  

Red Hat would like to thank Nokia Siemens Networks for reporting
CVE-2014-0101.

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#1092349)
  

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.

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.

Affected Products

• Red Hat Enterprise Linux Server - AUS 6.2 x86_64

Fixes

• BZ - 1070705 - CVE-2014-0101 kernel: net: sctp: null pointer dereference when processing authenticated cookie_echo chunk
• BZ - 1094232 - CVE-2014-0196 kernel: pty layer race condition leading to memory corruption

CVEs

• CVE-2014-0101
• CVE-2014-2523
• CVE-2014-0196

References

• https://access.redhat.com/security/updates/classification/#important

Red Hat Enterprise Linux Server - AUS 6.2

SRPM
kernel-2.6.32-220.51.1.el6.src.rpm	SHA-256: 77780c104d3eaf4b6f35122afb8311b742a544e9757bdeb786a9f222d2b12b84
x86_64
kernel-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 1fae77c9314b74a79d2cc465fe4d1a69bbe2685c71a8038b6f8e827cae21fdbd
kernel-debug-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 6e3a054988aab84426d05bf2221fc8704e0db96701c919dce63eaeedd18b090c
kernel-debug-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 802b833f121acd94c6809a3e67bbe296807b242a438214331f35400d18fa391f
kernel-debug-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 802b833f121acd94c6809a3e67bbe296807b242a438214331f35400d18fa391f
kernel-debug-devel-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: d6979be058b751d94d3ecd6669a118e19621a23efaf55dcef0a3426e0f08fc22
kernel-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: d1fe923188af2378a92c21cc0a2a1ef7e08b2cfd7a51276354452f06502242e2
kernel-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: d1fe923188af2378a92c21cc0a2a1ef7e08b2cfd7a51276354452f06502242e2
kernel-debuginfo-common-x86_64-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 9f2a2031c31689fb3a785933583273d3426087daf8289b1429026c9a1dc4d266
kernel-debuginfo-common-x86_64-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 9f2a2031c31689fb3a785933583273d3426087daf8289b1429026c9a1dc4d266
kernel-devel-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: b66eb464f293f858819a8d21a4980a96848a370ea97ea94ca078925f5abe7964
kernel-doc-2.6.32-220.51.1.el6.noarch.rpm	SHA-256: 59b12f45ea4b246b396a668c4e592e5f97c801eb1b817f7df26e81442231ca7e
kernel-firmware-2.6.32-220.51.1.el6.noarch.rpm	SHA-256: 578e592ea2595082e2fdcad27d00b666cb46e52b35f492269b13fa10a199ea1b
kernel-headers-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 0ebf14b7540728f4c5cc058135f02055c58420015877251a208bc3778e00e599
perf-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: ef05bb1c216bd7d29fc4e1db3c3b4d5f43a8f8959c30ceec3a9b8f433712f853
perf-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 4a37d491b4130bf4c906168254d0d20a738f7d077a3555834e3e8da1cc0b183f
perf-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 4a37d491b4130bf4c906168254d0d20a738f7d077a3555834e3e8da1cc0b183f
python-perf-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: b2bbbea3fb02f40074df4fcce8f9f382970e15bd32b9e22cf779e89614c733b8
python-perf-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 5dc3c1125eb23817131c9f6e0b211ae5155dc1008a651cf55e163ef39e4941ae
python-perf-debuginfo-2.6.32-220.51.1.el6.x86_64.rpm	SHA-256: 5dc3c1125eb23817131c9f6e0b211ae5155dc1008a651cf55e163ef39e4941ae