Ubuntu 2946-1: Linux kernel vulnerabilities

    Date06 Apr 2016
    CategoryUbuntu
    33
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2946-1
    April 06, 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:
    
    Venkatesh Pottem discovered a use-after-free vulnerability in the Linux
    kernel's CXGB3 driver. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)
    
    Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux
    Extended Verification Module (EVM). An attacker could use this to affect
    system integrity. (CVE-2016-2085)
    
    David Herrmann discovered that the Linux kernel incorrectly accounted file
    descriptors to the original opener for in-flight file descriptors sent over
    a unix domain socket. A local attacker could use this to cause a denial of
    service (resource exhaustion). (CVE-2016-2550)
    
    It was discovered that the Linux kernel did not enforce limits on the
    amount of data allocated to buffer pipes. A local attacker could use this
    to cause a denial of service (resource exhaustion). (CVE-2016-2847)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-85-generic   3.13.0-85.129
      linux-image-3.13.0-85-generic-lpae  3.13.0-85.129
      linux-image-3.13.0-85-lowlatency  3.13.0-85.129
      linux-image-3.13.0-85-powerpc-e500  3.13.0-85.129
      linux-image-3.13.0-85-powerpc-e500mc  3.13.0-85.129
      linux-image-3.13.0-85-powerpc-smp  3.13.0-85.129
      linux-image-3.13.0-85-powerpc64-emb  3.13.0-85.129
      linux-image-3.13.0-85-powerpc64-smp  3.13.0-85.129
    
    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-2946-1
      CVE-2015-8812, CVE-2016-2085, CVE-2016-2550, CVE-2016-2847
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-85.129
    
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