Linux Security
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    Linux Security

    Ubuntu 4068-1: Linux kernel vulnerabilities

    Date
    1600
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4068-1
    July 23, 2019
    
    linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-raspi2,
    linux-snapdragon vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-oracle: Linux kernel for Oracle Cloud systems
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    
    Details:
    
    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 18.04 LTS:
      linux-image-4.15.0-1018-oracle  4.15.0-1018.20
      linux-image-4.15.0-1037-gcp     4.15.0-1037.39
      linux-image-4.15.0-1039-kvm     4.15.0-1039.39
      linux-image-4.15.0-1041-raspi2  4.15.0-1041.44
      linux-image-4.15.0-1044-aws     4.15.0-1044.46
      linux-image-4.15.0-1058-snapdragon  4.15.0-1058.64
      linux-image-4.15.0-55-generic   4.15.0-55.60
      linux-image-4.15.0-55-generic-lpae  4.15.0-55.60
      linux-image-4.15.0-55-lowlatency  4.15.0-55.60
      linux-image-aws                 4.15.0.1044.43
      linux-image-gcp                 4.15.0.1037.39
      linux-image-generic             4.15.0.55.57
      linux-image-generic-lpae        4.15.0.55.57
      linux-image-kvm                 4.15.0.1039.39
      linux-image-lowlatency          4.15.0.55.57
      linux-image-oracle              4.15.0.1018.21
      linux-image-powerpc-e500mc      4.15.0.55.57
      linux-image-powerpc-smp         4.15.0.55.57
      linux-image-powerpc64-emb       4.15.0.55.57
      linux-image-powerpc64-smp       4.15.0.55.57
      linux-image-raspi2              4.15.0.1041.39
      linux-image-snapdragon          4.15.0.1058.61
      linux-image-virtual             4.15.0.55.57
    
    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.
    
    References:
      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/4.15.0-55.60
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1044.46
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1037.39
      https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1039.39
      https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1018.20
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1041.44
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1058.64
    

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