Moderate CentOS kernel Security Update


kernel-2.6.32-504.30.3.el6.i686.rpm, kernel-2.6.32-504.30.3.el6.src.rpm, kernel-2.6.32-504.30.3.el6.x86_64.rpm, kernel-abi-whitelists-2.6.32-504.30.3.el6.noarch.rpm, kernel-debug-2.6.32-504.30.3.el6.i686.rpm, kernel-debug-2.6.32-504.30.3.el6.x86_64.rpm, kernel-debug-devel-2.6.32-504.30.3.el6.i686.rpm, kernel-debug-devel-2.6.32-504.30.3.el6.x86_64.rpm, kernel-devel-2.6.32-504.30.3.el6.i686.rpm, kernel-devel-2.6.32-504.30.3.el6.x86_64.rpm, kernel-doc-2.6.32-504.30.3.el6.noarch.rpm, kernel-firmware-2.6.32-504.30.3.el6.noarch.rpm, kernel-headers-2.6.32-504.30.3.el6.i686.rpm, kernel-headers-2.6.32-504.30.3.el6.x86_64.rpm, perf-2.6.32-504.30.3.el6.i686.rpm, perf-2.6.32-504.30.3.el6.x86_64.rpm, python-perf-2.6.32-504.30.3.el6.i686.rpm, python-perf-2.6.32-504.30.3.el6.x86_64.rpm,
2018-01-18 11:10
2017-07-27 19:09
2017-04-01 19:09
2017-01-05 20:13


Updated kernel packages that fix multiple security issues, several bugs,
and add one enhancement are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate 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.

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

* A NULL pointer dereference flaw was found in the way the Linux kernel's
virtual console implementation handled reference counting when accessing
pseudo-terminal device files (/dev/pts/*). A local, unprivileged attacker
could use this flaw to crash the system. (CVE-2011-5321, 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)

* An integer overflow flaw was found in the way the Linux kernel randomized
the stack for processes on certain 64-bit architecture systems, such as
x86-64, causing the stack entropy to be reduced by four. (CVE-2015-1593,

* A flaw was found in the way the Linux kernel's 32-bit emulation
implementation handled forking or closing of a task with an 'int80' entry.
A local user could potentially use this flaw to escalate their privileges
on the system. (CVE-2015-2830, Low)

* 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)

These updated kernel packages also include numerous bug fixes and one
enhancement. Space precludes documenting all of these changes in this
advisory. For information on the most significant of these changes, users
are directed to the following article on the Red Hat Customer Portal:

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add this
enhancement. The system must be rebooted for this update to take effect.
Please see

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Affected package information

Release Package Patched in
6 kernel kernel-2.6.32-504.30.3.el6.i686.rpm
kernel kernel-2.6.32-504.30.3.el6.src.rpm
kernel kernel-2.6.32-504.30.3.el6.x86_64.rpm
kernel-abi-whitelists kernel-abi-whitelists-2.6.32-504.30.3.el6.noarch.rpm
kernel-debug kernel-debug-2.6.32-504.30.3.el6.i686.rpm
kernel-debug kernel-debug-2.6.32-504.30.3.el6.x86_64.rpm
kernel-debug-devel kernel-debug-devel-2.6.32-504.30.3.el6.i686.rpm
kernel-debug-devel kernel-debug-devel-2.6.32-504.30.3.el6.x86_64.rpm
kernel-devel kernel-devel-2.6.32-504.30.3.el6.i686.rpm
kernel-devel kernel-devel-2.6.32-504.30.3.el6.x86_64.rpm
kernel-doc kernel-doc-2.6.32-504.30.3.el6.noarch.rpm
kernel-firmware kernel-firmware-2.6.32-504.30.3.el6.noarch.rpm
kernel-headers kernel-headers-2.6.32-504.30.3.el6.i686.rpm
kernel-headers kernel-headers-2.6.32-504.30.3.el6.x86_64.rpm
perf perf-2.6.32-504.30.3.el6.i686.rpm
perf perf-2.6.32-504.30.3.el6.x86_64.rpm
python-perf python-perf-2.6.32-504.30.3.el6.i686.rpm
python-perf python-perf-2.6.32-504.30.3.el6.x86_64.rpm