Linux-2.6 security update for Debian
Posted on: 09/09/2011 10:04 AM

A linux-2.6 security update has been released for Debian GNU/Linux

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Debian Security Advisory DSA-2303-1 Moritz Muehlenhoff, Dann Frazier
September 8, 2011
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Package : linux-2.6
Vulnerability : privilege escalation/denial of service/information leak
Problem type : local/remote
Debian-specific: no
CVE Id(s) : CVE-2011-1020 CVE-2011-1576 CVE-2011-2484 CVE-2011-2491
CVE-2011-2492 CVE-2011-2495 CVE-2011-2496 CVE-2011-2497
CVE-2011-2517 CVE-2011-2525 CVE-2011-2700 CVE-2011-2723
CVE-2011-2905 CVE-2011-2909 CVE-2011-2918 CVE-2011-2928
CVE-2011-3188 CVE-2011-3191

Several vulnerabilities have been discovered in the Linux kernel that may lead
to a denial of service or privilege escalation. The Common Vulnerabilities and
Exposures project identifies the following problems:


Kees Cook discovered an issue in the /proc filesystem that allows local
users to gain access to sensitive process information after execution of a
setuid binary.


Ryan Sweat discovered an issue in the VLAN implementation. Local users may
be able to cause a kernel memory leak, resulting in a denial of service.


Vasiliy Kulikov of Openwall discovered that the number of exit handlers that
a process can register is not capped, resulting in local denial of service
through resource exhaustion (cpu time and memory).


Vasily Averin discovered an issue with the NFS locking implementation. A
malicious NFS server can cause a client to hang indefinitely in an unlock


Marek Kroemeke and Filip Palian discovered that uninitialized struct
elements in the Bluetooth subsystem could lead to a leak of sensitive kernel
memory through leaked stack memory.


Vasiliy Kulikov of Openwall discovered that the io file of a process' proc
directory was world-readable, resulting in local information disclosure of
information such as password lengths.


Robert Swiecki discovered that mremap() could be abused for local denial of
service by triggering a BUG_ON assert.


Dan Rosenberg discovered an integer underflow in the Bluetooth subsystem,
which could lead to denial of service or privilege escalation.


It was discovered that the netlink-based wireless configuration interface
performed insufficient length validation when parsing SSIDs, resulting in
buffer overflows. Local users with the CAP_NET_ADMIN capability can cause a
denial of service.


Ben Pfaff reported an issue in the network scheduling code. A local user
could cause a denial of service (NULL pointer dereference) by sending a
specially crafted netlink message.


Mauro Carvalho Chehab of Red Hat reported a buffer overflow issue in the
driver for the Si4713 FM Radio Transmitter driver used by N900 devices.
Local users could exploit this issue to cause a denial of service or
potentially gain elevated privileges.


Brent Meshier reported an issue in the GRO (generic receive offload)
implementation. This can be exploited by remote users to create a denial of
service (system crash) in certain network device configurations.


Christian Ohm discovered that the 'perf' analysis tool searches for its
config files in the current working directory. This could lead to denial of
service or potential privilege escalation if a user with elevated privileges
is tricked into running 'perf' in a directory under the control of the


Vasiliy Kulikov of Openwall discovered that a programming error in
the Comedi driver could lead to the information disclosure through
leaked stack memory.


Vince Weaver discovered that incorrect handling of software event overflows
in the 'perf' analysis tool could lead to local denial of service.


Timo Warns discovered that insufficient validation of Be filesystem images
could lead to local denial of service if a malformed filesystem image is


Dan Kaminsky reported a weakness of the sequence number generation in the
TCP protocol implementation. This can be used by remote attackers to inject
packets into an active session.


Darren Lavender reported an issue in the Common Internet File System (CIFS).
A malicious file server could cause memory corruption leading to a denial of

This update also includes a fix for a regression introduced with the previous
security fix for CVE-2011-1768 (Debian: #633738)

For the stable distribution (squeeze), this problem has been fixed in version
2.6.32-35squeeze1. Updates for issues impacting the oldstable distribution
(lenny) will be available soon.

The following matrix lists additional source packages that were rebuilt for
compatibility with or to take advantage of this update:

Debian 6.0 (squeeze)
user-mode-linux 2.6.32-1um-4+35squeeze1

We recommend that you upgrade your linux-2.6 and user-mode-linux packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:

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