Ubuntu 3160-1: Linux kernel vulnerabilities

    Date20 Dec 2016
    CategoryUbuntu
    62
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3160-1
    December 20, 2016
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    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 a race condition existed in the procfs
    environ_read function in the Linux kernel, leading to an integer
    underflow. A local attacker could use this to expose sensitive
    information (kernel memory). (CVE-2016-7916)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-106-generic  3.13.0-106.153
      linux-image-3.13.0-106-generic-lpae  3.13.0-106.153
      linux-image-3.13.0-106-lowlatency  3.13.0-106.153
      linux-image-3.13.0-106-powerpc-e500  3.13.0-106.153
      linux-image-3.13.0-106-powerpc-e500mc  3.13.0-106.153
      linux-image-3.13.0-106-powerpc-smp  3.13.0-106.153
      linux-image-3.13.0-106-powerpc64-emb  3.13.0-106.153
      linux-image-3.13.0-106-powerpc64-smp  3.13.0-106.153
      linux-image-generic             3.13.0.106.114
      linux-image-generic-lpae        3.13.0.106.114
      linux-image-lowlatency          3.13.0.106.114
      linux-image-powerpc-e500        3.13.0.106.114
      linux-image-powerpc-e500mc      3.13.0.106.114
      linux-image-powerpc-smp         3.13.0.106.114
      linux-image-powerpc64-emb       3.13.0.106.114
      linux-image-powerpc64-smp       3.13.0.106.114
    
    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-3160-1
      CVE-2016-6213, CVE-2016-7916
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-106.153
    
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