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[SECURITY] [DSA 3503-1] linux security update

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Debian Security Advisory DSA-3503-1                   security@debian.org
https://www.debian.org/security/                            Ben Hutchings
March 03, 2016                        https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2013-4312 CVE-2015-7566 CVE-2015-8767 CVE-2015-8785
                 CVE-2015-8812 CVE-2015-8816 CVE-2015-8830 CVE-2016-0723
                 CVE-2016-0774 CVE-2016-2069 CVE-2016-2384 CVE-2016-2543
                 CVE-2016-2544 CVE-2016-2545 CVE-2016-2546 CVE-2016-2547
                 CVE-2016-2548 CVE-2016-2549 CVE-2016-2550

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service, information
leak or data loss.


    Tetsuo Handa discovered that users can use pipes queued on local
    (Unix) sockets to allocate an unfair share of kernel memory, leading
    to denial-of-service (resource exhaustion).

    This issue was previously mitigated for the stable suite by limiting
    the total number of files queued by each user on local sockets. The
    new kernel version in both suites includes that mitigation plus
    limits on the total size of pipe buffers allocated for each user.


    Ralf Spenneberg of OpenSource Security reported that the visor
    driver crashes when a specially crafted USB device without bulk-out
    endpoint is detected.


    An SCTP denial-of-service was discovered which can be triggered by a
    local attacker during a heartbeat timeout event after the 4-way


    It was discovered that local users permitted to write to a file on a
    FUSE filesystem could cause a denial of service (unkillable loop in
    the kernel).


    A flaw was found in the iw_cxgb3 Infiniband driver. Whenever it
    could not send a packet because the network was congested, it would
    free the packet buffer but later attempt to send the packet again.
    This use-after-free could result in a denial of service (crash or
    hang), data loss or privilege escalation.


    A use-after-free vulnerability was discovered in the USB hub driver.
    This may be used by a physically present user for privilege


    Ben Hawkes of Google Project Zero reported that the AIO interface
    permitted reading or writing 2 GiB of data or more in a single
    chunk, which could lead to an integer overflow when applied to
    certain filesystems, socket or device types. The full security
    impact has not been evaluated.


    A use-after-free vulnerability was discovered in the TIOCGETD ioctl.
    A local attacker could use this flaw for denial-of-service.


    It was found that the fix for CVE-2015-1805 in kernel versions older
    than Linux 3.16 did not correctly handle the case of a partially
    failed atomic read. A local, unprivileged user could use this flaw
    to crash the system or leak kernel memory to user space.


    Andy Lutomirski discovered a race condition in flushing of the TLB
    when switching tasks on an x86 system. On an SMP system this could
    possibly lead to a crash, information leak or privilege escalation.


    Andrey Konovalov found that a crafted USB MIDI device with an
    invalid USB descriptor could trigger a double-free. This may be used
    by a physically present user for privilege escalation.


    Dmitry Vyukov found that the core sound sequencer driver (snd-seq)
    lacked a necessary check for a null pointer, allowing a user
    with access to a sound sequencer device to cause a denial-of-
    service (crash).

CVE-2016-2544, CVE-2016-2546, CVE-2016-2547, CVE-2016-2548

    Dmitry Vyukov found various race conditions in the sound subsystem
    (ALSA)'s management of timers. A user with access to sound devices
    could use these to cause a denial-of-service (crash or hang) or
    possibly for privilege escalation.


    Dmitry Vyukov found a flaw in list manipulation in the sound
    subsystem (ALSA)'s management of timers. A user with access to sound
    devices could use this to cause a denial-of-service (crash or hang)
    or possibly for privilege escalation.


    Dmitry Vyukov found a potential deadlock in the sound subsystem
    (ALSA)'s use of high resolution timers. A user with access to sound
    devices could use this to cause a denial-of-service (hang).


    The original mitigation of CVE-2013-4312, limiting the total number
    of files a user could queue on local sockets, was flawed. A user
    given a local socket opened by another user, for example through the
    systemd socket activation mechanism, could make use of the other
    user's quota, again leading to a denial-of-service (resource
    exhaustion). This is fixed by accounting queued files to the sender
    rather than the socket opener.

For the oldstable distribution (wheezy), these problems have been fixed
in version 3.2.73-2+deb7u3. The oldstable distribution (wheezy) is not
affected by CVE-2015-8830.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt20-1+deb8u4. CVE-2015-7566, CVE-2015-8767 and
CVE-2016-0723 were already fixed in DSA-3448-1. CVE-2016-0774 does not
affect the stable distribution.

We recommend that you upgrade your linux packages.

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

Mailing list: debian-security-announce@lists.debian.org
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