Ubuntu 3776-2: Linux kernel (Xenial HWE) vulnerabilities

    Date01 Oct 2018
    CategoryUbuntu
    1840
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3776-2
    October 01, 2018
    
    linux-lts-xenial, linux-aws vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-3776-1 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.
    
    Jann Horn discovered that the vmacache subsystem did not properly handle
    sequence number overflows, leading to a use-after-free vulnerability. A
    local attacker could use this to cause a denial of service (system crash)
    or execute arbitrary code. (CVE-2018-17182)
    
    It was discovered that the paravirtualization implementation in the Linux
    kernel did not properly handle some indirect calls, reducing the
    effectiveness of Spectre v2 mitigations for paravirtual guests. A local
    attacker could use this to expose sensitive information. (CVE-2018-15594)
    
    It was discovered that microprocessors utilizing speculative execution and
    prediction of return addresses via Return Stack Buffer (RSB) may allow
    unauthorized memory reads via sidechannel attacks. An attacker could use
    this to expose sensitive information. (CVE-2018-15572)
    
    It was discovered that a NULL pointer dereference could be triggered in the
    OCFS2 file system implementation in the Linux kernel. A local attacker
    could use this to cause a denial of service (system crash).
    (CVE-2017-18216)
    
    It was discovered that a race condition existed in the raw MIDI driver for
    the Linux kernel, leading to a double free vulnerability. A local attacker
    could use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2018-10902)
    
    It was discovered that a stack-based buffer overflow existed in the iSCSI
    target implementation of the Linux kernel. A remote attacker could use this
    to cause a denial of service (system crash). (CVE-2018-14633)
    
    It was discovered that the YUREX USB device driver for the Linux kernel did
    not properly restrict user space reads or writes. A physically proximate
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2018-16276)
    
    It was discovered that a memory leak existed in the IRDA subsystem of the
    Linux kernel. A local attacker could use this to cause a denial of service
    (kernel memory exhaustion). (CVE-2018-6554)
    
    It was discovered that a use-after-free vulnerability existed in the IRDA
    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-2018-6555)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-1031-aws      4.4.0-1031.34
      linux-image-4.4.0-137-generic   4.4.0-137.163~14.04.1
      linux-image-4.4.0-137-generic-lpae  4.4.0-137.163~14.04.1
      linux-image-4.4.0-137-lowlatency  4.4.0-137.163~14.04.1
      linux-image-4.4.0-137-powerpc-e500mc  4.4.0-137.163~14.04.1
      linux-image-4.4.0-137-powerpc-smp  4.4.0-137.163~14.04.1
      linux-image-4.4.0-137-powerpc64-emb  4.4.0-137.163~14.04.1
      linux-image-4.4.0-137-powerpc64-smp  4.4.0-137.163~14.04.1
      linux-image-aws                 4.4.0.1031.31
      linux-image-generic-lpae-lts-xenial  4.4.0.137.117
      linux-image-generic-lts-xenial  4.4.0.137.117
      linux-image-lowlatency-lts-xenial  4.4.0.137.117
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.137.117
      linux-image-powerpc-smp-lts-xenial  4.4.0.137.117
      linux-image-powerpc64-emb-lts-xenial  4.4.0.137.117
      linux-image-powerpc64-smp-lts-xenial  4.4.0.137.117
    
    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://usn.ubuntu.com/usn/usn-3776-2
      https://usn.ubuntu.com/usn/usn-3776-1
      CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572,
      CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554,
      CVE-2018-6555
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1031.34
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-137.163~14.04.1
    
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