Ubuntu 4320-1: Linux kernel vulnerability

    Date 06 Apr 2020
    437
    Posted By LinuxSecurity Advisories
    The system could be made to crash or expose sensitive information.
    ==========================================================================
    Ubuntu Security Notice USN-4320-1
    April 06, 2020
    
    linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 ESM
    
    Summary:
    
    The system could be made to crash or expose sensitive information.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for
    Trusty
    
    Details:
    
    Al Viro discovered that the vfs layer in the Linux kernel contained a use-
    after-free vulnerability. A local attacker could use this to cause a denial
    of service (system crash) or possibly expose sensitive information (kernel
    memory).
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1069-kvm      4.4.0-1069.76
      linux-image-4.4.0-1105-aws      4.4.0-1105.116
      linux-image-4.4.0-1131-raspi2   4.4.0-1131.140
      linux-image-4.4.0-1135-snapdragon  4.4.0-1135.143
      linux-image-4.4.0-177-generic   4.4.0-177.207
      linux-image-4.4.0-177-generic-lpae  4.4.0-177.207
      linux-image-4.4.0-177-lowlatency  4.4.0-177.207
      linux-image-4.4.0-177-powerpc-e500mc  4.4.0-177.207
      linux-image-4.4.0-177-powerpc-smp  4.4.0-177.207
      linux-image-4.4.0-177-powerpc64-emb  4.4.0-177.207
      linux-image-4.4.0-177-powerpc64-smp  4.4.0-177.207
      linux-image-aws                 4.4.0.1105.109
      linux-image-generic             4.4.0.177.185
      linux-image-generic-lpae        4.4.0.177.185
      linux-image-kvm                 4.4.0.1069.69
      linux-image-lowlatency          4.4.0.177.185
      linux-image-powerpc-e500mc      4.4.0.177.185
      linux-image-powerpc-smp         4.4.0.177.185
      linux-image-powerpc64-emb       4.4.0.177.185
      linux-image-powerpc64-smp       4.4.0.177.185
      linux-image-raspi2              4.4.0.1131.131
      linux-image-snapdragon          4.4.0.1135.127
      linux-image-virtual             4.4.0.177.185
    
    Ubuntu 14.04 ESM:
      linux-image-4.4.0-1065-aws      4.4.0-1065.69
      linux-image-4.4.0-177-generic   4.4.0-177.207~14.04.1
      linux-image-4.4.0-177-generic-lpae  4.4.0-177.207~14.04.1
      linux-image-4.4.0-177-lowlatency  4.4.0-177.207~14.04.1
      linux-image-4.4.0-177-powerpc-e500mc  4.4.0-177.207~14.04.1
      linux-image-4.4.0-177-powerpc-smp  4.4.0-177.207~14.04.1
      linux-image-4.4.0-177-powerpc64-emb  4.4.0-177.207~14.04.1
      linux-image-4.4.0-177-powerpc64-smp  4.4.0-177.207~14.04.1
      linux-image-aws                 4.4.0.1065.66
      linux-image-generic-lpae-lts-xenial  4.4.0.177.156
      linux-image-generic-lts-xenial  4.4.0.177.156
      linux-image-lowlatency-lts-xenial  4.4.0.177.156
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.177.156
      linux-image-powerpc-smp-lts-xenial  4.4.0.177.156
      linux-image-powerpc64-emb-lts-xenial  4.4.0.177.156
      linux-image-powerpc64-smp-lts-xenial  4.4.0.177.156
      linux-image-virtual-lts-xenial  4.4.0.177.156
    
    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/4320-1
      CVE-2020-8428
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-177.207
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1105.116
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1069.76
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1131.140
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1135.143
    

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