Ubuntu 3221-2: Linux kernel (HWE) vulnerability

    Date07 Mar 2017
    CategoryUbuntu
    53
    Posted ByLinuxSecurity Advisories
    The system could be made to crash or run programs as an administrator.
    ==========================================================================
    Ubuntu Security Notice USN-3221-2
    March 08, 2017
    
    linux-hwe vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    The system could be made to crash or run programs as an administrator.
    
    Software Description:
    - linux-hwe: Linux hardware enablement (HWE) kernel for Ubuntu 16.04 LTS
    
    Details:
    
    USN-3221-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.10.
    This update provides the corresponding updates for the Linux Hardware
    Enablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04 LTS.
    
    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. (CVE-2017-2636)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.8.0-41-generic    4.8.0-41.44~16.04.1
      linux-image-4.8.0-41-generic-lpae  4.8.0-41.44~16.04.1
      linux-image-4.8.0-41-lowlatency  4.8.0-41.44~16.04.1
      linux-image-4.8.0-41-powerpc-e500mc  4.8.0-41.44~16.04.1
      linux-image-4.8.0-41-powerpc-smp  4.8.0-41.44~16.04.1
      linux-image-4.8.0-41-powerpc64-emb  4.8.0-41.44~16.04.1
      linux-image-generic-hwe-16.04   4.8.0.41.12
      linux-image-generic-lpae-hwe-16.04  4.8.0.41.12
      linux-image-lowlatency-hwe-16.04  4.8.0.41.12
    
    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-3221-2
      http://www.ubuntu.com/usn/usn-3221-1
      CVE-2017-2636
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-hwe/4.8.0-41.44~16.04.1
    
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