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             AUSCERT External Security Bulletin Redistribution

                         linux-2.6 security update
                              31 January 2011


        AusCERT Security Bulletin Summary

Product:           kernel
Publisher:         Debian
Operating System:  Debian GNU/Linux 5
Impact/Access:     Root Compromise        -- Existing Account
                   Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-0521 CVE-2010-4668 CVE-2010-4656
                   CVE-2010-4649 CVE-2010-4565 CVE-2010-4529
                   CVE-2010-4527 CVE-2010-4526 CVE-2010-4346
                   CVE-2010-4342 CVE-2010-4258 CVE-2010-4249
                   CVE-2010-4248 CVE-2010-4243 CVE-2010-4242
                   CVE-2010-4163 CVE-2010-4162 CVE-2010-4158
                   CVE-2010-3699 CVE-2010-0435 

Reference:         ESB-2011.0036

Original Bulletin: 

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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:


    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.


    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.


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


    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.


    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.


    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.


    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.


    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.


    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.


    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.


    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.


    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


    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.


    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.


    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.


    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.


    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.


    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.


    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


    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

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/

Mailing list: debian-security-announce@lists.debian.org
Version: GnuPG v1.4.10 (GNU/Linux)


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