A linux kernel security update is available for Debian GNU/Linux

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Debian Security Advisory DSA-2153-1 security@debian.org
http://www.debian.org/security/ dann frazier
January 30, 2011 http://www.debian.org/security/faq
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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-2010-0435 CVE-2010-3699 CVE-2010-4158 CVE-2010-4162
CVE-2010-4163 CVE-2010-4242 CVE-2010-4243 CVE-2010-4248
CVE-2010-4249 CVE-2010-4258 CVE-2010-4342 CVE-2010-4346
CVE-2010-4526 CVE-2010-4527 CVE-2010-4529 CVE-2010-4565
CVE-2010-4649 CVE-2010-4656 CVE-2010-4668 CVE-2011-0521

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

CVE-2010-0435

Gleb Napatov reported an issue in the KVM subsystem that allows virtual
machines to cause a denial of service of the host machine by executing mov
to/from DR instructions.

CVE-2010-3699

Keir Fraser provided a fix for an issue in the Xen subsystem. A guest can
cause a denial of service on the host by retaining a leaked reference to a
device. This can result in a zombie domain, xenwatch process hangs, and xm
command failures.

CVE-2010-4158

Dan Rosenberg discovered an issue in the socket filters subsystem, allowing
local unprivileged users to obtain the contents of sensitive kernel memory.

CVE-2010-4162

Dan Rosenberg discovered an overflow issue in the block I/O subsystem that
allows local users to map large numbers of pages, resulting in a denial of
service due to invocation of the out of memory killer.

CVE-2010-4163

Dan Rosenberg discovered an issue in the block I/O subsystem. Due to
improper validation of iov segments, local users can trigger a kernel panic
resulting in a denial of service.

CVE-2010-4242

Alan Cox reported an issue in the Bluetooth subsystem. Local users with
sufficient permission to access HCI UART devices can cause a denial of
service (NULL pointer dereference) due to a missing check for an existing
tty write operation.

CVE-2010-4243

Brad Spengler reported a denial-of-service issue in the kernel memory
accounting system. By passing large argv/envp values to exec, local users
can cause the out of memory killer to kill processes owned by other users.

CVE-2010-4248

Oleg Nesterov reported an issue in the POSIX CPU timers subsystem. Local
users can cause a denial of service (Oops) due to incorrect assumptions
about thread group leader behavior.

CVE-2010-4249

Vegard Nossum reported an issue with the UNIX socket garbage collector.
Local users can consume all of LOWMEM and decrease system performance by
overloading the system with inflight sockets.

CVE-2010-4258

Nelson Elhage reported an issue in Linux oops handling. Local users may be
able to obtain elevated privileges if they are able to trigger an oops with
a process' fs set to KERNEL_DS.

CVE-2010-4342

Nelson Elhage reported an issue in the econet protocol. Remote attackers can
cause a denial of service by sending an Acorn Universal Networking packet
over UDP.

CVE-2010-4346

Tavis Ormandy discovered an issue in the install_special_mapping routine
which allows local users to bypass the mmap_min_addr security restriction.
Combined with an otherwise low severity local denial of service
vulnerability (NULL pointer dereference), a local user could obtain elevated
privileges.

CVE-2010-4526

Eugene Teo reported a race condition in the Linux SCTP implementation.
Remote users can cause a denial of service (kernel memory corruption) by
transmitting an ICMP unreachable message to a locked socket.

CVE-2010-4527

Dan Rosenberg reported two issues in the OSS soundcard driver. Local users
with access to the device (members of group 'audio' on default Debian
installations) may contain access to sensitive kernel memory or cause a
buffer overflow, potentially leading to an escalation of privileges.

CVE-2010-4529

Dan Rosenberg reported an issue in the Linux kernel IrDA socket
implementation on non-x86 architectures. Local users may be able to gain
access to sensitive kernel memory via a specially crafted IRLMP_ENUMDEVICES
getsockopt call.

CVE-2010-4565

Dan Rosenberg reported an issue in the Linux CAN protocol implementation.
Local users can obtain the address of a kernel heap object which might help
facilitate system exploitation.

CVE-2010-4649

Dan Carpenter reported an issue in the uverb handling of the InfiniBand
subsystem. A potential buffer overflow may allow local users to cause a
denial of service (memory corruption) by passing in a large cmd.ne value.

CVE-2010-4656

Kees Cook reported an issue in the driver for I/O-Warrior USB devices.
Local users with access to these devices maybe able to overrun kernel
buffers, resulting in a denial of service or privilege escalation.

CVE-2010-4668

Dan Rosenberg reported an issue in the block subsystem. A local user can
cause a denial of service (kernel panic) by submitting certain 0-length I/O
requests.

CVE-2011-0521

Dan Carpenter reported an issue in the DVB driver for AV7110 cards. Local
users can pass a negative info->num value, corrupting kernel memory and
causing a denial of service.

For the stable distribution (lenny), this problem has been fixed in
version 2.6.26-26lenny2.

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

Debian 5.0 (lenny)
user-mode-linux 2.6.26-1um-2+26lenny2

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

Note that these updates will not become active until after your system is
rebooted.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/