Ubuntu 3847-2: Linux kernel (HWE) vulnerabilities

    Date20 Dec 2018
    CategoryUbuntu
    7686
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3847-2
    December 20, 2018
    
    linux-hwe, linux-aws-hwe, linux-azure, 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-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    USN-3847-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
    16.04 LTS.
    
    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 an integer overrun vulnerability existed in the
    POSIX timers implementation in the Linux kernel. A local attacker could use
    this to cause a denial of service. (CVE-2018-12896)
    
    Noam Rathaus discovered that a use-after-free vulnerability existed in the
    Infiniband implementation in the Linux kernel. An attacker could use this
    to cause a denial of service (system crash). (CVE-2018-14734)
    
    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 the BPF verifier in the Linux kernel did not
    correctly compute numeric bounds in some situations. A local attacker could
    use this to cause a denial of service (system crash) or possibly execute
    arbitrary code. (CVE-2018-18445)
    
    Kanda Motohiro discovered that writing extended attributes to an XFS file
    system in the Linux kernel in certain situations could cause an error
    condition to occur. A local attacker could use this to cause a denial of
    service. (CVE-2018-18690)
    
    It was discovered that an integer overflow vulnerability existed in the
    CDROM driver of the Linux kernel. A local attacker could use this to expose
    sensitive information (kernel memory). (CVE-2018-18710)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-1026-gcp     4.15.0-1026.27~16.04.1
      linux-image-4.15.0-1031-aws     4.15.0-1031.33~16.04.1
      linux-image-4.15.0-1036-azure   4.15.0-1036.38~16.04.1
      linux-image-4.15.0-43-generic   4.15.0-43.46~16.04.1
      linux-image-4.15.0-43-generic-lpae  4.15.0-43.46~16.04.1
      linux-image-4.15.0-43-lowlatency  4.15.0-43.46~16.04.1
      linux-image-aws-hwe             4.15.0.1031.32
      linux-image-azure               4.15.0.1036.41
      linux-image-gcp                 4.15.0.1026.40
      linux-image-generic-hwe-16.04   4.15.0.43.64
      linux-image-generic-lpae-hwe-16.04  4.15.0.43.64
      linux-image-gke                 4.15.0.1026.40
      linux-image-lowlatency-hwe-16.04  4.15.0.43.64
    
    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-3847-2
      https://usn.ubuntu.com/usn/usn-3847-1
      CVE-2018-10902, CVE-2018-12896, CVE-2018-14734, CVE-2018-16276,
      CVE-2018-18445, CVE-2018-18690, CVE-2018-18710
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1031.33~16.04.1
      https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1036.38~16.04.1
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1026.27~16.04.1
      https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-43.46~16.04.1
    
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