Ubuntu 3234-2: Linux kernel (Xenial HWE) vulnerabilities

    Date15 Mar 2017
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-3234-2
    March 15, 2017
    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-3234-1 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.
    Ralf Spenneberg discovered that the ext4 implementation in the Linux kernel
    did not properly validate meta block groups. An attacker with physical
    access could use this to specially craft an ext4 image that causes a denial
    of service (system crash). (CVE-2016-10208)
    It was discovered that the Linux kernel did not clear the setgid bit during
    a setxattr call on a tmpfs filesystem. A local attacker could use this to
    gain elevated group privileges. (CVE-2017-5551)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-67-generic    4.4.0-67.88~14.04.1
      linux-image-4.4.0-67-generic-lpae  4.4.0-67.88~14.04.1
      linux-image-4.4.0-67-lowlatency  4.4.0-67.88~14.04.1
      linux-image-4.4.0-67-powerpc-e500mc  4.4.0-67.88~14.04.1
      linux-image-4.4.0-67-powerpc-smp  4.4.0-67.88~14.04.1
      linux-image-4.4.0-67-powerpc64-emb  4.4.0-67.88~14.04.1
      linux-image-4.4.0-67-powerpc64-smp  4.4.0-67.88~14.04.1
    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-2016-10208, CVE-2017-5551
    Package Information:
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