Ubuntu 3256-2: Linux kernel (HWE) vulnerability

    Date05 Apr 2017
    CategoryUbuntu
    68
    Posted ByLinuxSecurity Advisories
    The system could be made to crash under certain conditions.
    ==========================================================================
    Ubuntu Security Notice USN-3256-2
    April 05, 2017
    
    linux-hwe, linux-lts-trusty, linux-lts-xenial vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    
    Summary:
    
    The system could be made to crash under certain conditions.
    
    Software Description:
    - linux-hwe: Linux hardware enablement (HWE) kernel
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise
    
    Details:
    
    USN-3256-1 fixed vulnerabilities in the Linux kernel for Ubuntu
    14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. This update provides
    the corresponding updates for the Linux Hardware Enablement (HWE)
    kernel for each of the respective prior Ubuntu LTS releases.
    
    Andrey Konovalov discovered that the AF_PACKET implementation in the Linux
    kernel did not properly validate certain block-size data. A local attacker
    could use this to cause a denial of service (system crash).
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.8.0-46-generic    4.8.0-46.49~16.04.1
      linux-image-4.8.0-46-generic-lpae  4.8.0-46.49~16.04.1
      linux-image-4.8.0-46-lowlatency  4.8.0-46.49~16.04.1
      linux-image-generic-hwe-16.04   4.8.0.46.18
      linux-image-generic-lpae-hwe-16.04  4.8.0.46.18
      linux-image-lowlatency-hwe-16.04  4.8.0.46.18
    
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-72-generic    4.4.0-72.93~14.04.1
      linux-image-4.4.0-72-generic-lpae  4.4.0-72.93~14.04.1
      linux-image-4.4.0-72-lowlatency  4.4.0-72.93~14.04.1
      linux-image-4.4.0-72-powerpc-e500mc  4.4.0-72.93~14.04.1
      linux-image-4.4.0-72-powerpc-smp  4.4.0-72.93~14.04.1
      linux-image-4.4.0-72-powerpc64-smp  4.4.0-72.93~14.04.1
      linux-image-generic-lpae-lts-xenial  4.4.0.72.59
      linux-image-generic-lts-xenial  4.4.0.72.59
      linux-image-lowlatency-lts-xenial  4.4.0.72.59
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.72.59
      linux-image-powerpc-smp-lts-xenial  4.4.0.72.59
      linux-image-powerpc64-smp-lts-xenial  4.4.0.72.59
    
    Ubuntu 12.04 LTS:
      linux-image-3.13.0-116-generic  3.13.0-116.163~precise1
      linux-image-3.13.0-116-generic-lpae  3.13.0-116.163~precise1
      linux-image-generic-lpae-lts-trusty  3.13.0.116.107
      linux-image-generic-lts-trusty  3.13.0.116.107
    
    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.
    
    References:
      http://www.ubuntu.com/usn/usn-3256-2
      http://www.ubuntu.com/usn/usn-3256-1
      CVE-2017-7308
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-hwe/4.8.0-46.49~16.04.1
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-72.93~14.04.1
      https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-116.163~precise1
    
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