Ubuntu 4161-1: Linux kernel vulnerability

    Date21 Oct 2019
    CategoryUbuntu
    257
    Posted ByLinuxSecurity Advisories
    Ubuntu Large
    The system could be made to crash under certain conditions.
    ==========================================================================
    Ubuntu Security Notice USN-4161-1
    October 21, 2019
    
    linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2
    vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.10
    
    Summary:
    
    The system could be made to crash under certain conditions.
    
    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
    
    Details:
    
    It was discovered that the IPv6 routing implementation in the Linux kernel
    contained a reference counting error leading to a use-after-free
    vulnerability. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.10:
      linux-image-5.3.0-1004-aws      5.3.0-1004.4
      linux-image-5.3.0-1004-azure    5.3.0-1004.4
      linux-image-5.3.0-1004-kvm      5.3.0-1004.4
      linux-image-5.3.0-1005-gcp      5.3.0-1005.5
      linux-image-5.3.0-1008-raspi2   5.3.0-1008.9
      linux-image-5.3.0-19-generic    5.3.0-19.20
      linux-image-5.3.0-19-generic-lpae  5.3.0-19.20
      linux-image-5.3.0-19-lowlatency  5.3.0-19.20
      linux-image-5.3.0-19-snapdragon  5.3.0-19.20
      linux-image-aws                 5.3.0.1004.5
      linux-image-azure               5.3.0.1004.21
      linux-image-gcp                 5.3.0.1005.5
      linux-image-generic             5.3.0.19.22
      linux-image-generic-lpae        5.3.0.19.22
      linux-image-gke                 5.3.0.1005.5
      linux-image-kvm                 5.3.0.1004.4
      linux-image-lowlatency          5.3.0.19.22
      linux-image-raspi2              5.3.0.1008.4
      linux-image-snapdragon          5.3.0.19.22
      linux-image-virtual             5.3.0.19.22
    
    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/4161-1
      CVE-2019-18198
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.3.0-19.20
      https://launchpad.net/ubuntu/+source/linux-aws/5.3.0-1004.4
      https://launchpad.net/ubuntu/+source/linux-azure/5.3.0-1004.4
      https://launchpad.net/ubuntu/+source/linux-gcp/5.3.0-1005.5
      https://launchpad.net/ubuntu/+source/linux-kvm/5.3.0-1004.4
      https://launchpad.net/ubuntu/+source/linux-raspi2/5.3.0-1008.9
    
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