Ubuntu 3208-2: Linux kernel (Xenial HWE) vulnerabilities

    Date22 Feb 2017
    CategoryUbuntu
    55
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3208-2
    February 22, 2017
    
    linux-lts-xenial 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-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-3208-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
    14.04 LTS.
    
    It was discovered that the generic SCSI block layer in the Linux kernel did
    not properly restrict write operations in certain situations. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly gain administrative privileges. (CVE-2016-10088)
    
    CAI Qian discovered that the sysctl implementation in the Linux kernel did
    not properly perform reference counting in some situations. An unprivileged
    attacker could use this to cause a denial of service (system hang).
    (CVE-2016-9191)
    
    Jim Mattson discovered that the KVM implementation in the Linux kernel
    mismanages the #BP and #OF exceptions. A local attacker in a guest virtual
    machine could use this to cause a denial of service (guest OS crash).
    (CVE-2016-9588)
    
    Andy Lutomirski and Willy Tarreau discovered that the KVM implementation in
    the Linux kernel did not properly emulate instructions on the SS segment
    register. A local attacker in a guest virtual machine could use this to
    cause a denial of service (guest OS crash) or possibly gain administrative
    privileges in the guest OS. (CVE-2017-2583)
    
    Dmitry Vyukov discovered that the KVM implementation in the Linux kernel
    improperly emulated certain instructions. A local attacker could use this
    to obtain sensitive information (kernel memory). (CVE-2017-2584)
    
    It was discovered that the KLSI KL5KUSB105 serial-to-USB device driver in
    the Linux kernel did not properly initialize memory related to logging. A
    local attacker could use this to expose sensitive information (kernel
    memory). (CVE-2017-5549)
    
    Andrey Konovalov discovered a use-after-free vulnerability in the DCCP
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash) or possibly gain administrative
    privileges. (CVE-2017-6074)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-64-generic    4.4.0-64.85~14.04.1
      linux-image-4.4.0-64-generic-lpae  4.4.0-64.85~14.04.1
      linux-image-4.4.0-64-lowlatency  4.4.0-64.85~14.04.1
      linux-image-4.4.0-64-powerpc-e500mc  4.4.0-64.85~14.04.1
      linux-image-4.4.0-64-powerpc-smp  4.4.0-64.85~14.04.1
      linux-image-4.4.0-64-powerpc64-emb  4.4.0-64.85~14.04.1
      linux-image-4.4.0-64-powerpc64-smp  4.4.0-64.85~14.04.1
      linux-image-generic-lpae-lts-xenial  4.4.0.64.50
      linux-image-generic-lts-xenial  4.4.0.64.50
      linux-image-lowlatency-lts-xenial  4.4.0.64.50
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.64.50
      linux-image-powerpc-smp-lts-xenial  4.4.0.64.50
      linux-image-powerpc64-emb-lts-xenial  4.4.0.64.50
      linux-image-powerpc64-smp-lts-xenial  4.4.0.64.50
    
    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-3208-2
      http://www.ubuntu.com/usn/usn-3208-1
      CVE-2016-10088, CVE-2016-9191, CVE-2016-9588, CVE-2017-2583,
      CVE-2017-2584, CVE-2017-5549, CVE-2017-6074
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-64.85~14.04.1
    
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