kernel, perf, python security update

CentOS Errata and Security Advisory CESA-2015:1534

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

• An integer overflow flaw was found in the way the Linux kernel’s
  netfilter connection tracking implementation loaded extensions. An attacker
  on a local network could potentially send a sequence of specially crafted
  packets that would initiate the loading of a large number of extensions,
  causing the targeted system in that network to crash. (CVE-2014-9715,
  Moderate)

• A stack-based buffer overflow flaw was found in the Linux kernel’s early
  load microcode functionality. On a system with UEFI Secure Boot enabled, a
  local, privileged user could use this flaw to increase their privileges to
  the kernel (ring0) level, bypassing intended restrictions in place.
  (CVE-2015-2666, Moderate)

• It was found that the Linux kernel’s ping socket implementation did not
  properly handle socket unhashing during spurious disconnects, which could
  lead to a use-after-free flaw. On x86-64 architecture systems, a local user
  able to create ping sockets could use this flaw to crash the system.
  On non-x86-64 architecture systems, a local user able to create ping
  sockets could use this flaw to escalate their privileges on the system.
  (CVE-2015-3636, Moderate)

• It was found that the Linux kernel’s TCP/IP protocol suite implementation
  for IPv6 allowed the Hop Limit value to be set to a smaller value than the
  default one. An attacker on a local network could use this flaw to prevent
  systems on that network from sending or receiving network packets.
  (CVE-2015-2922, Low)

Red Hat would like to thank Nathan Hoad for reporting the CVE-2014-9715
issue.

This update also fixes several bugs. Refer to the following Knowledgebase
article for further information:

https://access.redhat.com/articles/1474193

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.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2015-August/083459.html

Affected packages:
kernel
kernel-abi-whitelists
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-headers
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python-perf

Upstream details at:
https://access.redhat.com/errata/RHSA-2015:1534