Ubuntu 3146-1: Linux kernel vulnerabilities

    Date30 Nov 2016
    CategoryUbuntu
    64
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3146-1
    November 30, 2016
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    It was discovered that the __get_user_asm_ex implementation in the Linux
    kernel for x86/x86_64 contained extended asm statements that were
    incompatible with the exception table. A local attacker could use this to
    gain administrative privileges. (CVE-2016-9644)
    
    Andreas Gruenbacher and Jan Kara discovered that the filesystem
    implementation in the Linux kernel did not clear the setgid bit during a
    setxattr call. A local attacker could use this to possibly elevate group
    privileges. (CVE-2016-7097)
    
    Marco Grassi discovered that the driver for Areca RAID Controllers in the
    Linux kernel did not properly validate control messages. A local attacker
    could use this to cause a denial of service (system crash) or possibly gain
    privileges. (CVE-2016-7425)
    
    Daxing Guo discovered a stack-based buffer overflow in the Broadcom
    IEEE802.11n FullMAC driver in the Linux kernel. A local attacker could use
    this to cause a denial of service (system crash) or possibly gain
    privileges. (CVE-2016-8658)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-51-generic    4.4.0-51.72
      linux-image-4.4.0-51-generic-lpae  4.4.0-51.72
      linux-image-4.4.0-51-lowlatency  4.4.0-51.72
      linux-image-4.4.0-51-powerpc-e500mc  4.4.0-51.72
      linux-image-4.4.0-51-powerpc-smp  4.4.0-51.72
      linux-image-4.4.0-51-powerpc64-emb  4.4.0-51.72
      linux-image-4.4.0-51-powerpc64-smp  4.4.0-51.72
      linux-image-generic             4.4.0.51.54
      linux-image-generic-lpae        4.4.0.51.54
      linux-image-lowlatency          4.4.0.51.54
      linux-image-powerpc-e500mc      4.4.0.51.54
      linux-image-powerpc-smp         4.4.0.51.54
      linux-image-powerpc64-emb       4.4.0.51.54
      linux-image-powerpc64-smp       4.4.0.51.54
    
    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-3146-1
      CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-51.72
    
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