RHEL 6 : kernel (RHSA-2011:0928)

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
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.

This update fixes the following security issues :

* It was found that the receive hook in the ipip_init() function in
the ipip module, and in the ipgre_init() function in the ip_gre
module, could be called before network namespaces setup is complete.
If packets were received at the time the ipip or ip_gre module was
still being loaded into the kernel, it could cause a denial of
service. (CVE-2011-1767, CVE-2011-1768, Moderate)

* It was found that an mmap() call with the MAP_PRIVATE flag on
'/dev/zero' would create transparent hugepages and trigger a certain
robustness check. A local, unprivileged user could use this flaw to
cause a denial of service. (CVE-2011-2479, Moderate)

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-2011-1767.html
https://www.redhat.com/security/data/cve/CVE-2011-1768.html
https://www.redhat.com/security/data/cve/CVE-2011-2479.html
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/
http://rhn.redhat.com/errata/RHSA-2011-0928.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.4
(CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 4.0
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 55584 ()

Bugtraq ID: 47852
47853
48347

CVE ID: CVE-2011-1767
CVE-2011-1768
CVE-2011-2479