Linux Security
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    Ubuntu 3221-1: Linux kernel vulnerability

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    The system could be made to crash or run programs as an administrator.
    ==========================================================================
    Ubuntu Security Notice USN-3221-1
    March 08, 2017
    
    linux, linux-raspi2 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.10
    
    Summary:
    
    The system could be made to crash or run programs as an administrator.
    
    Software Description:
    - linux: Linux kernel
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    Alexander Popov discovered that the N_HDLC line discipline implementation
    in the Linux kernel contained a double-free vulnerability. A local attacker
    could use this to cause a denial of service (system crash) or possibly gain
    administrative privileges.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.10:
      linux-image-4.8.0-1028-raspi2   4.8.0-1028.31
      linux-image-4.8.0-41-generic    4.8.0-41.44
      linux-image-4.8.0-41-generic-lpae  4.8.0-41.44
      linux-image-4.8.0-41-lowlatency  4.8.0-41.44
      linux-image-4.8.0-41-powerpc-e500mc  4.8.0-41.44
      linux-image-4.8.0-41-powerpc-smp  4.8.0-41.44
      linux-image-4.8.0-41-powerpc64-emb  4.8.0-41.44
      linux-image-generic             4.8.0.41.52
      linux-image-generic-lpae        4.8.0.41.52
      linux-image-lowlatency          4.8.0.41.52
      linux-image-powerpc-e500mc      4.8.0.41.52
      linux-image-powerpc-smp         4.8.0.41.52
      linux-image-powerpc64-emb       4.8.0.41.52
      linux-image-raspi2              4.8.0.1028.31
    
    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:
      https://www.ubuntu.com/usn/usn-3221-1
      CVE-2017-2636
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.8.0-41.44
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.8.0-1028.31
    

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