Ubuntu 3484-1: Linux kernel vulnerability

    Date21 Nov 2017
    CategoryUbuntu
    47
    Posted ByLinuxSecurity Advisories
    The system could be made to crash or run programs as an administrator.
    ==========================================================================
    Ubuntu Security Notice USN-3484-1
    November 21, 2017
    
    linux, linux-raspi2 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 17.04
    
    Summary:
    
    The system could be made to crash or run programs as an administrator.
    
    Software Description:
    - linux: Linux kernel
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    It was discovered that the KVM subsystem in the Linux kernel did not
    properly keep track of nested levels in guest page tables. A local attacker
    in a guest VM could use this to cause a denial of service (host OS crash)
    or possibly execute arbitrary code in the host OS.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 17.04:
      linux-image-4.10.0-1021-raspi2  4.10.0-1021.24
      linux-image-4.10.0-40-generic   4.10.0-40.44
      linux-image-4.10.0-40-generic-lpae  4.10.0-40.44
      linux-image-4.10.0-40-lowlatency  4.10.0-40.44
      linux-image-generic             4.10.0.40.40
      linux-image-generic-lpae        4.10.0.40.40
      linux-image-lowlatency          4.10.0.40.40
      linux-image-raspi2              4.10.0.1021.22
    
    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-3484-1
      CVE-2017-12188
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.10.0-40.44
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1021.24
    
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