Ubuntu 3084-1: Linux kernel vulnerabilities

    Date19 Sep 2016
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-3084-1
    September 19, 2016
    linux vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 16.04 LTS
    Several security issues were fixed in the kernel.
    Software Description:
    - linux: Linux kernel
    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 16.04 LTS:
      linux-image-4.4.0-38-generic    4.4.0-38.57
      linux-image-4.4.0-38-generic-lpae  4.4.0-38.57
      linux-image-4.4.0-38-lowlatency  4.4.0-38.57
      linux-image-4.4.0-38-powerpc-e500mc  4.4.0-38.57
      linux-image-4.4.0-38-powerpc-smp  4.4.0-38.57
      linux-image-4.4.0-38-powerpc64-emb  4.4.0-38.57
      linux-image-4.4.0-38-powerpc64-smp  4.4.0-38.57
    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.
      CVE-2016-5412, CVE-2016-6136, CVE-2016-6156
    Package Information:
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