linux - security update

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

• CVE-2013-4312,
  CVE-2016-2847
  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.

• CVE-2015-7566
  Ralf Spenneberg of OpenSource Security reported that the visor
  driver crashes when a specially crafted USB device without bulk-out
  endpoint is detected.
• CVE-2015-8767
  An SCTP denial-of-service was discovered which can be triggered by a
  local attacker during a heartbeat timeout event after the 4-way
  handshake.
• CVE-2015-8785
  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).
• CVE-2015-8812
  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.
• CVE-2015-8816
  A use-after-free vulnerability was discovered in the USB hub driver.
  This may be used by a physically present user for privilege
  escalation.
• CVE-2015-8830
  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.
• CVE-2016-0723
  A use-after-free vulnerability was discovered in the TIOCGETD ioctl.
  A local attacker could use this flaw for denial-of-service.
• CVE-2016-0774
  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.
• CVE-2016-2069
  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.
• CVE-2016-2384
  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.
• CVE-2016-2543
  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.
• CVE-2016-2545
  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.
• CVE-2016-2549
  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).
• CVE-2016-2550
  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-2013-4312, 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.