linux-2.6 - security update

The linux-2.6 update issued as DLA-246-1 caused regressions. This
update corrects the defective patches applied in that update causing
these problems. For reference the original advisory text follows.

This update fixes the CVEs described below.

• CVE-2011-5321
  Jiri Slaby discovered that tty_driver_lookup_tty() may leak a
  reference to the tty driver. A local user could use this flaw
  to crash the system.
• CVE-2012-6689
  Pablo Neira Ayuso discovered that non-root user-space processes
  can send forged Netlink notifications to other processes. A local
  user could use this flaw for denial of service or privilege
  escalation.
• CVE-2014-3184
  Ben Hawkes discovered that various HID drivers may over-read the
  report descriptor buffer, possibly resulting in a crash if a HID
  with a crafted descriptor is plugged in.
• CVE-2014-8159
  It was found that the Linux kernel’s InfiniBand/RDMA subsystem did
  not properly sanitize input parameters while registering memory
  regions from user space via the (u)verbs API. A local user with
  access to a /dev/infiniband/uverbsX device could use this flaw to
  crash the system or, potentially, escalate their privileges on the
  system.
• CVE-2014-9683
  Dmitry Chernenkov discovered that eCryptfs writes past the end of
  the allocated buffer during encrypted filename decoding, resulting
  in local denial of service.
• CVE-2014-9728 / CVE-2014-9729 / CVE-2014-9730 / CVE-2014-9731 / CVE-2015-4167
  Carl Henrik Lunde discovered that the UDF implementation is
  missing several necessary length checks. A local user that can
  mount devices could use these various flaws to crash the system,
  to leak information from the kernel, or possibly for privilege
  escalation.
• CVE-2015-1805
  Red Hat discovered that the pipe iovec read and write
  implementations may iterate over the iovec twice but will modify
  the iovec such that the second iteration accesses the wrong
  memory. A local user could use this flaw to crash the system or
  possibly for privilege escalation. This may also result in data
  corruption and information leaks in pipes between non-malicious
  processes.
• CVE-2015-2041
  Sasha Levin discovered that the LLC subsystem exposed some
  variables as sysctls with the wrong type. On a 64-bit kernel, this
  possibly allows privilege escalation from a process with
  CAP_NET_ADMIN capability; it also results in a trivial information
  leak.
• CVE-2015-2042
  Sasha Levin discovered that the RDS subsystem exposed some
  variables as sysctls with the wrong type. On a 64-bit kernel, this
  results in a trivial information leak.
• CVE-2015-2830
  Andrew Lutomirski discovered that when a 64-bit task on an amd64
  kernel makes a fork(2) or clone(2) system call using int $0x80,
  the 32-bit compatibility flag is set (correctly) but is not
  cleared on return. As a result, both seccomp and audit will
  misinterpret the following system call by the task(s), possibly
  leading to a violation of security policy.
• CVE-2015-2922
  Modio AB discovered that the IPv6 subsystem would process a router
  advertisement that specifies no route but only a hop limit, which
  would then be applied to the interface that received it. This can
  result in loss of IPv6 connectivity beyond the local network.

This may be mitigated by disabling processing of IPv6 router
advertisements if they are not needed:

        sysctl net.ipv6.conf.default.accept\_ra=0
        sysctl net.ipv6.conf.<interface>.accept\_ra=0

• CVE-2015-3339
  It was found that the execve(2) system call can race with inode
  attribute changes made by chown(2). Although chown(2) clears the
  setuid/setgid bits of a file if it changes the respective owner ID,
  this race condition could result in execve(2) setting effective
  uid/gid to the new owner ID, a privilege escalation.

For the oldoldstable distribution (squeeze), these problems have been
fixed in version 2.6.32-48squeeze12.

For the oldstable distribution (wheezy), these problems were fixed in
linux version 3.2.68-1+deb7u1 or earlier, except for CVE-2015-1805 and
CVE-2015-4167 which will be fixed soon.

For the stable distribution (jessie), these problems were fixed in
linux version 3.16.7-ckt11-1 or earlier, except for CVE-2015-4167 which
will be fixed later.

We recommend that you upgrade your linux-2.6 packages.