RHEL 6 : kernel (RHSA-2011:0836)

This script is Copyright (C) 2011-2014 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 various
bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team 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.

This update fixes the following security issues :

* An integer underflow flaw, leading to a buffer overflow, was found
in the Linux kernel's Datagram Congestion Control Protocol (DCCP)
implementation. This could allow a remote attacker to cause a denial
of service. (CVE-2011-1770, Important)

* Missing sanity checks were found in setup_arg_pages() in the Linux
kernel. When making the size of the argument and environment area on
the stack very large, it could trigger a BUG_ON(), resulting in a
local denial of service. (CVE-2010-3858, Moderate)

* A missing validation check was found in the bcm_release() and
raw_release() functions in the Linux kernel's Controller Area Network
(CAN) implementation. This could allow a local, unprivileged user to
cause a denial of service. (CVE-2011-1598, CVE-2011-1748, Moderate)

* The fix for Red Hat Bugzilla bug 656461, as provided in
RHSA-2011:0542, introduced a regression in the cifs_close() function
in the Linux kernel's Common Internet File System (CIFS)
implementation. A local, unprivileged user with write access to a CIFS
file system could use this flaw to cause a denial of service.
(CVE-2011-1771, Moderate)

Red Hat would like to thank Dan Rosenberg for reporting CVE-2011-1770

Brad Spengler for reporting CVE-2010-3858
and Oliver Hartkopp for
reporting CVE-2011-1748.

This update also fixes various bugs. Documentation for these bug fixes
will be available shortly from the Technical Notes document linked to
in the References section.

Users should upgrade to these updated packages, which contain
backported patches to resolve these issues, and fix the bugs noted in
the Technical Notes. The system must be rebooted for this update to
take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2010-3858.html
https://www.redhat.com/security/data/cve/CVE-2011-1598.html
https://www.redhat.com/security/data/cve/CVE-2011-1748.html
https://www.redhat.com/security/data/cve/CVE-2011-1770.html
https://www.redhat.com/security/data/cve/CVE-2011-1771.html
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/
http://rhn.redhat.com/errata/RHSA-2011-0836.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.8
(CVSS2#E:ND/RL:OF/RC:ND)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 54941 ()

Bugtraq ID: 44301
47503
47768
47769
47835

CVE ID: CVE-2010-3858
CVE-2011-1598
CVE-2011-1748
CVE-2011-1770
CVE-2011-1771