Linux Security
    Linux Security
    Linux Security

    Ubuntu 2979-1: Linux kernel vulnerabilities

    Date 16 May 2016
    109
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2979-1
    May 16, 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:
    
    David Matlack discovered that the Kernel-based Virtual Machine (KVM)
    implementation in the Linux kernel did not properly restrict variable
    Memory Type Range Registers (MTRR) in KVM guests. A privileged user in a
    guest VM could use this to cause a denial of service (system crash) in the
    host, expose sensitive information from the host, or possibly gain
    administrative privileges in the host. (CVE-2016-3713)
    
    Philip Pettersson discovered that the Linux kernel's ASN.1 DER decoder did
    not properly process certificate files with tags of indefinite length. A
    local unprivileged attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code with administrative
    privileges. (CVE-2016-0758)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-22-generic    4.4.0-22.40
      linux-image-4.4.0-22-generic-lpae  4.4.0-22.40
      linux-image-4.4.0-22-lowlatency  4.4.0-22.40
      linux-image-4.4.0-22-powerpc-e500mc  4.4.0-22.40
      linux-image-4.4.0-22-powerpc-smp  4.4.0-22.40
      linux-image-4.4.0-22-powerpc64-emb  4.4.0-22.40
      linux-image-4.4.0-22-powerpc64-smp  4.4.0-22.40
    
    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:
      https://www.ubuntu.com/usn/usn-2979-1
      CVE-2016-0758, CVE-2016-3713
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-22.40
    

    Advisories

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