Ubuntu 3468-3: Linux kernel (GCP) vulnerabilities

    Date 31 Oct 2017
    74
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3468-3
    October 31, 2017
    
    linux-gcp vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    
    Details:
    
    It was discovered that the KVM subsystem in the Linux kernel did not
    properly bound guest IRQs. A local attacker in a guest VM could use this to
    cause a denial of service (host system crash). (CVE-2017-1000252)
    
    It was discovered that the Flash-Friendly File System (f2fs) implementation
    in the Linux kernel did not properly validate superblock metadata. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-10663)
    
    Anthony Perard discovered that the Xen virtual block driver did not
    properly initialize some data structures before passing them to user space.
    A local attacker in a guest VM could use this to expose sensitive
    information from the host OS or other guest VMs. (CVE-2017-10911)
    
    It was discovered that a use-after-free vulnerability existed in the POSIX
    message queue implementation in the Linux kernel. A local attacker could
    use this to cause a denial of service (system crash) or possibly execute
    arbitrary code. (CVE-2017-11176)
    
    Dave Chinner discovered that the XFS filesystem did not enforce that the
    realtime inode flag was settable only on filesystems on a realtime device.
    A local attacker could use this to cause a denial of service (system
    crash). (CVE-2017-14340)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.10.0-1008-gcp     4.10.0-1008.8
      linux-image-gcp                 4.10.0.1008.10
    
    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-3468-3
      https://www.ubuntu.com/usn/usn-3468-1
      CVE-2017-1000252, CVE-2017-10663, CVE-2017-10911, CVE-2017-11176,
      CVE-2017-14340
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-gcp/4.10.0-1008.8
    

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