Important CentOS kernel Security Update


kernel-2.6.18-409.el5.i686.rpm, kernel-2.6.18-409.el5.src.rpm, kernel-2.6.18-409.el5.x86_64.rpm, kernel-PAE-2.6.18-409.el5.i686.rpm, kernel-PAE-devel-2.6.18-409.el5.i686.rpm, kernel-debug-2.6.18-409.el5.i686.rpm, kernel-debug-2.6.18-409.el5.x86_64.rpm, kernel-debug-devel-2.6.18-409.el5.i686.rpm, kernel-debug-devel-2.6.18-409.el5.x86_64.rpm, kernel-devel-2.6.18-409.el5.i686.rpm, kernel-devel-2.6.18-409.el5.x86_64.rpm, kernel-doc-2.6.18-409.el5.noarch.rpm, kernel-headers-2.6.18-409.el5.i386.rpm, kernel-headers-2.6.18-409.el5.x86_64.rpm, kernel-xen-2.6.18-409.el5.i686.rpm, kernel-xen-2.6.18-409.el5.x86_64.rpm, kernel-xen-devel-2.6.18-409.el5.i686.rpm, kernel-xen-devel-2.6.18-409.el5.x86_64.rpm
CVE-2013-2596, CVE-2015-2151,
2017-07-27 19:10
CVE-2013-2596 linux
CVE-2015-2151 xen
2017-04-01 19:09
2017-01-05 20:14


Updated kernel packages that fix two security issues and two bugs are now
available for Red Hat Enterprise Linux 5.

Red Hat Product Security 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.

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 Frame
Buffer device implementation mapped kernel memory to user space via the
mmap syscall. A local user able to access a frame buffer device file
(/dev/fb*) could possibly use this flaw to escalate their privileges on the
system. (CVE-2013-2596, Important)

* It was found that the Xen hypervisor x86 CPU emulator implementation did
not correctly handle certain instructions with segment overrides,
potentially resulting in a memory corruption. A malicious guest user could
use this flaw to read arbitrary data relating to other guests, cause a
denial of service on the host, or potentially escalate their privileges on
the host. (CVE-2015-2151, Important)

This update also fixes the following bugs:

* Previously, the CPU power of a CPU group could be zero. As a consequence,
a kernel panic occurred at "find_busiest_group+570" with do_divide_error.
The provided patch ensures that the division is only performed if the CPU
power is not zero, and the aforementioned panic no longer occurs.

* Prior to this update, a bug occurred when performing an online resize of
an ext4 file system which had been previously converted from ext3. As a
consequence, the kernel crashed. The provided patch fixes online resizing
for such file systems by limiting the blockgroup search loop for non-extent
files, and the mentioned kernel crash no longer occurs. (BZ#1301100)

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.
Please see

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Affected package information

Release Package Patched in
5 kernel kernel-2.6.18-409.el5.i686.rpm
kernel kernel-2.6.18-409.el5.src.rpm
kernel kernel-2.6.18-409.el5.x86_64.rpm
kernel-debug kernel-debug-2.6.18-409.el5.i686.rpm
kernel-debug kernel-debug-2.6.18-409.el5.x86_64.rpm
kernel-debug-devel kernel-debug-devel-2.6.18-409.el5.i686.rpm
kernel-debug-devel kernel-debug-devel-2.6.18-409.el5.x86_64.rpm
kernel-devel kernel-devel-2.6.18-409.el5.i686.rpm
kernel-devel kernel-devel-2.6.18-409.el5.x86_64.rpm
kernel-doc kernel-doc-2.6.18-409.el5.noarch.rpm
kernel-headers kernel-headers-2.6.18-409.el5.i386.rpm
kernel-headers kernel-headers-2.6.18-409.el5.x86_64.rpm
kernel-PAE kernel-PAE-2.6.18-409.el5.i686.rpm
kernel-PAE-devel kernel-PAE-devel-2.6.18-409.el5.i686.rpm
kernel-xen kernel-xen-2.6.18-409.el5.i686.rpm
kernel-xen kernel-xen-2.6.18-409.el5.x86_64.rpm
kernel-xen-devel kernel-xen-devel-2.6.18-409.el5.x86_64.rpm
kernel-xen-devel kernel-xen-devel-2.6.18-409.el5.i686.rpm