RHEL 6 : kernel (RHSA-2011:0542)

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, address
several hundred bugs and add numerous enhancements are now available
as part of the ongoing support and maintenance of Red Hat Enterprise
Linux version 6. This is the first regular update.

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 :

* Multiple buffer overflow flaws were found in the Linux kernel's
Management Module Support for Message Passing Technology (MPT) based
controllers. A local, unprivileged user could use these flaws to cause
a denial of service, an information leak, or escalate their
privileges. (CVE-2011-1494, CVE-2011-1495, Important)

* A flaw was found in the Linux kernel's Ethernet bonding driver
implementation. Packets coming in from network devices that have more
than 16 receive queues to a bonding interface could cause a denial of
service. (CVE-2011-1581, Important)

* A flaw was found in the Linux kernel's networking subsystem. If the
number of packets received exceeded the receiver's buffer limit, they
were queued in a backlog, consuming memory, instead of being
discarded. A remote attacker could abuse this flaw to cause a denial
of service (out-of-memory condition). (CVE-2010-4251, Moderate)

* A flaw was found in the Linux kernel's Transparent Huge Pages (THP)
implementation. A local, unprivileged user could abuse this flaw to
allow the user stack (when it is using huge pages) to grow and cause a
denial of service. (CVE-2011-0999, Moderate)

* A flaw was found in the transmit methods (xmit) for the loopback and
InfiniBand transports in the Linux kernel's Reliable Datagram Sockets
(RDS) implementation. A local, unprivileged user could use this flaw
to cause a denial of service. (CVE-2011-1023, Moderate)

* A flaw in the Linux kernel's Event Poll (epoll) implementation could
allow a local, unprivileged user to cause a denial of service.
(CVE-2011-1082, Moderate)

* An inconsistency was found in the interaction between the Linux
kernel's method for allocating NFSv4 (Network File System version 4)
ACL data and the method by which it was freed. This inconsistency led
to a kernel panic which could be triggered by a local, unprivileged
user with files owned by said user on an NFSv4 share. (CVE-2011-1090,
Moderate)

* A missing validation check was found in the Linux kernel's
mac_partition() implementation, used for supporting file systems
created on Mac OS operating systems. A local attacker could use this
flaw to cause a denial of service by mounting a disk that contains
specially crafted partitions. (CVE-2011-1010, Low)

* A buffer overflow flaw in the DEC Alpha OSF partition implementation
in the Linux kernel could allow a local attacker to cause an
information leak by mounting a disk that contains specially crafted
partition tables. (CVE-2011-1163, Low)

* Missing validations of null-terminated string data structure
elements in the do_replace(), compat_do_replace(), do_ipt_get_ctl(),
do_ip6t_get_ctl(), and do_arpt_get_ctl() functions could allow a local
user who has the CAP_NET_ADMIN capability to cause an information
leak. (CVE-2011-1170, CVE-2011-1171, CVE-2011-1172, Low)

Red Hat would like to thank Dan Rosenberg for reporting CVE-2011-1494
and CVE-2011-1495
Nelson Elhage for reporting CVE-2011-1082
Timo
Warns for reporting CVE-2011-1010 and CVE-2011-1163
and Vasiliy
Kulikov for reporting CVE-2011-1170, CVE-2011-1171, and CVE-2011-1172.

This update also fixes several hundred bugs and adds enhancements.
Refer to the Red Hat Enterprise Linux 6.1 Release Notes for
information on the most significant of these changes, and the
Technical Notes for further information, both linked to in the
References.

All Red Hat Enterprise Linux 6 users are advised to install these
updated packages, which correct these issues, and fix the bugs and add
the enhancements noted in the Red Hat Enterprise Linux 6.1 Release
Notes and Technical Notes. The system must be rebooted for this update
to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2010-3881.html
https://www.redhat.com/security/data/cve/CVE-2010-4251.html
https://www.redhat.com/security/data/cve/CVE-2010-4805.html
https://www.redhat.com/security/data/cve/CVE-2011-0999.html
https://www.redhat.com/security/data/cve/CVE-2011-1010.html
https://www.redhat.com/security/data/cve/CVE-2011-1023.html
https://www.redhat.com/security/data/cve/CVE-2011-1082.html
https://www.redhat.com/security/data/cve/CVE-2011-1090.html
https://www.redhat.com/security/data/cve/CVE-2011-1163.html
https://www.redhat.com/security/data/cve/CVE-2011-1170.html
https://www.redhat.com/security/data/cve/CVE-2011-1171.html
https://www.redhat.com/security/data/cve/CVE-2011-1172.html
https://www.redhat.com/security/data/cve/CVE-2011-1494.html
https://www.redhat.com/security/data/cve/CVE-2011-1495.html
https://www.redhat.com/security/data/cve/CVE-2011-1581.html
http://www.nessus.org/u?d2334068
http://rhn.redhat.com/errata/RHSA-2011-0542.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false