RHEL 6 : kernel (RHSA-2015:0803)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated kernel packages that fix multiple security issues and two bugs
are now available for Red Hat Enterprise Linux 6.4 Advanced Update
Support.

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.

* It was found that the Linux kernel's Infiniband subsystem did not
properly sanitize input parameters while registering memory regions
from user space via the (u)verbs API. A local user with access to a
/dev/infiniband/uverbsX device could use this flaw to crash the system
or, potentially, escalate their privileges on the system.
(CVE-2014-8159, Important)

* 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 parse_rock_ridge_inode_internal() function of
the Linux kernel's ISOFS implementation did not correctly check
relocated directories when processing Rock Ridge child link (CL) tags.
An attacker with physical access to the system could use a specially
crafted ISO image to crash the system or, potentially, escalate their
privileges on the system. (CVE-2014-5471, CVE-2014-5472, Low)

Red Hat would like to thank Mellanox for reporting the CVE-2014-8159
issue.

This update also fixes the following bugs :

* The kernel could sometimes panic due to a possible division by zero
in the kernel scheduler. This bug has been fixed by defining a new
div64_ul() division function and correcting the affected calculation
in the proc_sched_show_task() function. (BZ#1199898)

* When repeating a Coordinated Universal Time (UTC) value during a
leap second (when the UTC time should be 23:59:60), the International
Atomic Time (TAI) timescale previously stopped as the kernel NTP code
incremented the TAI offset one second too late. A patch has been
provided, which fixes the bug by incrementing the offset during the
leap second itself. Now, the correct TAI is set during the leap
second. (BZ#1201672)

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2013-2596.html
https://www.redhat.com/security/data/cve/CVE-2014-5471.html
https://www.redhat.com/security/data/cve/CVE-2014-5472.html
https://www.redhat.com/security/data/cve/CVE-2014-8159.html
http://rhn.redhat.com/errata/RHSA-2015-0803.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.9
(CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.1
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 82790 ()

Bugtraq ID:

CVE ID: CVE-2013-2596
CVE-2014-5471
CVE-2014-5472
CVE-2014-8159

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