Ubuntu 2643-2: Linux kernel regression

    Date21 Jun 2015
    Posted ByLinuxSecurity Advisories
    The system could be made to crash under certain conditions.
    Ubuntu Security Notice USN-2643-2
    June 21, 2015
    linux regression
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 14.04 LTS
    The system could be made to crash under certain conditions.
    Software Description:
    - linux: Linux kernel
    The Fix for CVE-2015-1328 introduced a regression into the Linux kernel's
    overlayfs file system. The removal of a directory that only exists on the
    lower layer results in a kernel panic.
    We apologize for the inconvenience.
    Original advisory details:
     Philip Pettersson discovered a privilege escalation when using overlayfs
     mounts inside of user namespaces. A local user could exploit this flaw to
     gain administrative privileges on the system.
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-55-generic   3.13.0-55.94
      linux-image-3.13.0-55-generic-lpae  3.13.0-55.94
      linux-image-3.13.0-55-lowlatency  3.13.0-55.94
      linux-image-3.13.0-55-powerpc-e500  3.13.0-55.94
      linux-image-3.13.0-55-powerpc-e500mc  3.13.0-55.94
      linux-image-3.13.0-55-powerpc-smp  3.13.0-55.94
      linux-image-3.13.0-55-powerpc64-emb  3.13.0-55.94
      linux-image-3.13.0-55-powerpc64-smp  3.13.0-55.94
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    Package Information:
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