Ubuntu 3084-2: Linux kernel (Xenial HWE) vulnerabilities

    Date19 Sep 2016
    CategoryUbuntu
    87
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3084-2
    September 19, 2016
    
    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-3084-1 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.
    
    Pengfei Wang discovered a race condition in the audit subsystem in the
    Linux kernel. A local attacker could use this to corrupt audit logs or
    disrupt system-call auditing. (CVE-2016-6136)
    
    It was discovered that the powerpc and powerpc64 hypervisor-mode KVM
    implementation in the Linux kernel for did not properly maintain state
    about transactional memory. An unprivileged attacker in a guest could cause
    a denial of service (CPU lockup) in the host OS. (CVE-2016-5412)
    
    Pengfei Wang discovered a race condition in the Chrome OS embedded
    controller device driver in the Linux kernel. A local attacker could use
    this to cause a denial of service (system crash). (CVE-2016-6156)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-38-generic    4.4.0-38.57~14.04.1
      linux-image-4.4.0-38-generic-lpae  4.4.0-38.57~14.04.1
      linux-image-4.4.0-38-lowlatency  4.4.0-38.57~14.04.1
      linux-image-4.4.0-38-powerpc-e500mc  4.4.0-38.57~14.04.1
      linux-image-4.4.0-38-powerpc-smp  4.4.0-38.57~14.04.1
      linux-image-4.4.0-38-powerpc64-emb  4.4.0-38.57~14.04.1
      linux-image-4.4.0-38-powerpc64-smp  4.4.0-38.57~14.04.1
    
    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-3084-2
      http://www.ubuntu.com/usn/usn-3084-1
      CVE-2016-5412, CVE-2016-6136, CVE-2016-6156
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-38.57~14.04.1
    
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