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Test Kennung:
Kategorie:Red Hat Local Security Checks
Titel:RedHat Update for kernel RHSA-2016:0450-01
Zusammenfassung:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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.

Affected Software/OS:
kernel on Red Hat Enterprise Linux (v. 5 server)

Please Install the Updated Packages.

CVSS Score:

CVSS Vector:

Querverweis: Common Vulnerability Exposure (CVE) ID: CVE-2013-2596
BugTraq ID: 59264
RedHat Security Advisories: RHSA-2015:0695
RedHat Security Advisories: RHSA-2015:0782
RedHat Security Advisories: RHSA-2015:0803
Common Vulnerability Exposure (CVE) ID: CVE-2015-2151
BugTraq ID: 73015
Debian Security Information: DSA-3181 (Google Search)
SuSE Security Announcement: openSUSE-SU-2015:0732 (Google Search)
CopyrightCopyright (C) 2016 Greenbone Networks GmbH

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