Linux Security
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    Linux Security

    Ubuntu 4069-1: Linux kernel vulnerabilities

    Date
    1849
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4069-1
    July 23, 2019
    
    linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2,
    linux-snapdragon vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.04
    
    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-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    
    Details:
    
    It was discovered that an integer overflow existed in the Linux kernel when
    reference counting pages, leading to potential use-after-free issues. A
    local attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2019-11487)
    
    Jann Horn discovered that a race condition existed in the Linux kernel when
    performing core dumps. A local attacker could use this to cause a denial of
    service (system crash) or expose sensitive information. (CVE-2019-11599)
    
    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 19.04:
      linux-image-5.0.0-1011-aws      5.0.0-1011.12
      linux-image-5.0.0-1011-gcp      5.0.0-1011.11
      linux-image-5.0.0-1011-kvm      5.0.0-1011.12
      linux-image-5.0.0-1012-azure    5.0.0-1012.12
      linux-image-5.0.0-1013-raspi2   5.0.0-1013.13
      linux-image-5.0.0-1017-snapdragon  5.0.0-1017.18
      linux-image-5.0.0-21-generic    5.0.0-21.22
      linux-image-5.0.0-21-generic-lpae  5.0.0-21.22
      linux-image-5.0.0-21-lowlatency  5.0.0-21.22
      linux-image-aws                 5.0.0.1011.11
      linux-image-azure               5.0.0.1012.11
      linux-image-gcp                 5.0.0.1011.11
      linux-image-generic             5.0.0.21.22
      linux-image-generic-lpae        5.0.0.21.22
      linux-image-gke                 5.0.0.1011.11
      linux-image-kvm                 5.0.0.1011.11
      linux-image-lowlatency          5.0.0.21.22
      linux-image-raspi2              5.0.0.1013.10
      linux-image-snapdragon          5.0.0.1017.10
      linux-image-virtual             5.0.0.21.22
    
    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/4069-1
      CVE-2019-11487, CVE-2019-11599, CVE-2019-11833, CVE-2019-11884
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.0.0-21.22
      https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1011.12
      https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1012.12
      https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1011.11
      https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1011.12
      https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1013.13
      https://launchpad.net/ubuntu/+source/linux-snapdragon/5.0.0-1017.18
    

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