Ubuntu 2640-2: Linux kernel regression

    Date21 Jun 2015
    CategoryUbuntu
    46
    Posted ByLinuxSecurity Advisories
    The system could be made to crash under certain conditions.
    ==========================================================================
    Ubuntu Security Notice USN-2640-2
    June 21, 2015
    
    linux regression
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 LTS
    
    Summary:
    
    The system could be made to crash under certain conditions.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    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 12.04 LTS:
      linux-image-3.2.0-86-generic    3.2.0-86.124
      linux-image-3.2.0-86-generic-pae  3.2.0-86.124
      linux-image-3.2.0-86-highbank   3.2.0-86.124
      linux-image-3.2.0-86-omap       3.2.0-86.124
      linux-image-3.2.0-86-powerpc-smp  3.2.0-86.124
      linux-image-3.2.0-86-powerpc64-smp  3.2.0-86.124
      linux-image-3.2.0-86-virtual    3.2.0-86.124
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2640-2
      http://www.ubuntu.com/usn/usn-2640-1
      http://bugs.launchpad.net/bugs/1465998
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.2.0-86.124
    
    
    
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