RHEL 6 : kernel (RHSA-2012:0116)

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Synopsis :

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

Description :

Updated kernel packages that fix various security issues and several
bugs are now available for Red Hat Enterprise Linux 6.1 Extended
Update Support.

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 :

* The proc file system could allow a local, unprivileged user to
obtain sensitive information or possibly cause integrity issues.
(CVE-2011-1020, Moderate)

* Non-member VLAN (virtual LAN) packet handling for interfaces in
promiscuous mode and also using the be2net driver could allow an
attacker on the local network to cause a denial of service.
(CVE-2011-3347, Moderate)

* A missing validation flaw was found in the Linux kernel's m_stop()
implementation. A local, unprivileged user could use this flaw to
trigger a denial of service. (CVE-2011-3637, Moderate)

* A flaw was found in the Linux kernel in the way splitting two
extents in ext4_ext_convert_to_initialized() worked. A local,
unprivileged user with the ability to mount and unmount ext4 file
systems could use this flaw to cause a denial of service.
(CVE-2011-3638, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux
kernel's key management facility handled user-defined key types. A
local, unprivileged user could use the keyctl utility to cause a
denial of service. (CVE-2011-4110, Moderate)

Red Hat would like to thank Kees Cook for reporting CVE-2011-1020

Somnath Kotur for reporting CVE-2011-3347
and Zheng Liu for reporting
CVE-2011-3638.

This update also fixes several bugs. Documentation for these changes
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 correct 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-2011-1020.html
https://www.redhat.com/security/data/cve/CVE-2011-3347.html
https://www.redhat.com/security/data/cve/CVE-2011-3638.html
https://www.redhat.com/security/data/cve/CVE-2011-4110.html
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/
http://rhn.redhat.com/errata/RHSA-2012-0116.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 4.0
(CVSS2#AV:L/AC:H/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 3.3
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 64027 ()

Bugtraq ID: 46567
50312
50322
50755
51361

CVE ID: CVE-2011-1020
CVE-2011-3347
CVE-2011-3638
CVE-2011-4110