Ubuntu 4068-2: Linux kernel (HWE) vulnerabilities

    Date22 Jul 2019
    CategoryUbuntu
    1229
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4068-2
    July 23, 2019
    
    linux-hwe, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    USN-4068-1 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 for Ubuntu
    16.04 LTS.
    
    Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in
    the Linux kernel did not properly restrict mmap() ranges in some
    situations. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2019-11085)
    
    It was discovered that a race condition leading to a use-after-free existed
    in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
    kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
    local attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2019-11815)
    
    It was discovered that the ext4 file system implementation in the Linux
    kernel did not properly zero out memory in some situations. A local
    attacker could use this to expose sensitive information (kernel memory).
    (CVE-2019-11833)
    
    It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
    implementation in the Linux kernel did not properly verify strings were
    NULL terminated in certain situations. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2019-11884)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-1037-gcp     4.15.0-1037.39~16.04.1
      linux-image-4.15.0-55-generic   4.15.0-55.60~16.04.2
      linux-image-4.15.0-55-generic-lpae  4.15.0-55.60~16.04.2
      linux-image-4.15.0-55-lowlatency  4.15.0-55.60~16.04.2
      linux-image-gcp                 4.15.0.1037.51
      linux-image-generic-hwe-16.04   4.15.0.55.76
      linux-image-generic-lpae-hwe-16.04  4.15.0.55.76
      linux-image-gke                 4.15.0.1037.51
      linux-image-lowlatency-hwe-16.04  4.15.0.55.76
      linux-image-oem                 4.15.0.55.76
      linux-image-virtual-hwe-16.04   4.15.0.55.76
    
    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/4068-2
      https://usn.ubuntu.com/4068-1
      CVE-2019-11085, CVE-2019-11815, CVE-2019-11833, CVE-2019-11884
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1037.39~16.04.1
      https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-55.60~16.04.2
    
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