Ubuntu 3161-2: Linux kernel (Xenial HWE) vulnerabilities

    Date20 Dec 2016
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-3161-2
    December 20, 2016
    linux-lts-xenial vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 14.04 LTS
    Several security issues were fixed in the kernel.
    Software Description:
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    USN-3161-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
    14.04 LTS.
    Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the
    TTY implementation in the Linux kernel. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2015-8964)
    It was discovered that the Video For Linux Two (v4l2) implementation in the
    Linux kernel did not properly handle multiple planes when processing a
    VIDIOC_DQBUF ioctl(). A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2016-4568)
    CAI Qian discovered that shared bind mounts in a mount namespace
    exponentially added entries without restriction to the Linux kernel's mount
    table. A local attacker could use this to cause a denial of service (system
    crash). (CVE-2016-6213)
    It was discovered that the KVM implementation for x86/x86_64 in the Linux
    kernel could dereference a null pointer. An attacker in a guest virtual
    machine could use this to cause a denial of service (system crash) in the
    KVM host. (CVE-2016-8630)
    Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation
    in the Linux kernel contained a buffer overflow when handling fragmented
    packets. A remote attacker could use this to possibly execute arbitrary
    code with administrative privileges. (CVE-2016-8633)
    Marco Grassi discovered that the TCP implementation in the Linux kernel
    mishandles socket buffer (skb) truncation. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2016-8645)
    Andrey Konovalov discovered that the SCTP implementation in the Linux
    kernel improperly handled validation of incoming data. A remote attacker
    could use this to cause a denial of service (system crash). (CVE-2016-9555)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-57-generic    4.4.0-57.78~14.04.1
      linux-image-4.4.0-57-generic-lpae  4.4.0-57.78~14.04.1
      linux-image-4.4.0-57-lowlatency  4.4.0-57.78~14.04.1
      linux-image-4.4.0-57-powerpc-e500mc  4.4.0-57.78~14.04.1
      linux-image-4.4.0-57-powerpc-smp  4.4.0-57.78~14.04.1
      linux-image-4.4.0-57-powerpc64-emb  4.4.0-57.78~14.04.1
      linux-image-4.4.0-57-powerpc64-smp  4.4.0-57.78~14.04.1
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    ATTENTION: Due to an unavoidable ABI change the kernel updates have
    been given a new version number, which requires you to recompile and
    reinstall all third party kernel modules you might have installed.
    Unless you manually uninstalled the standard kernel metapackages
    (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
    linux-powerpc), a standard system upgrade will automatically perform
    this as well.
      CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630,
      CVE-2016-8633, CVE-2016-8645, CVE-2016-9555
    Package Information:
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