Ubuntu 4303-1: Linux kernel vulnerability

    Date 16 Mar 2020
    304
    Posted By LinuxSecurity Advisories
    The system could be made to expose sensitive information.
    ==========================================================================
    Ubuntu Security Notice USN-4303-1
    March 17, 2020
    
    linux, linux-aws, linux-kvm vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    The system could be made to 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
    
    Details:
    
    Paulo Bonzini discovered that the KVM hypervisor implementation in the
    Linux kernel could improperly let a nested (level 2) guest access the
    resources of a parent (level 1) guest in certain situations. An attacker
    could use this to expose sensitive information.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1068-kvm      4.4.0-1068.75
      linux-image-4.4.0-1104-aws      4.4.0-1104.115
      linux-image-4.4.0-176-generic   4.4.0-176.206
      linux-image-4.4.0-176-generic-lpae  4.4.0-176.206
      linux-image-4.4.0-176-lowlatency  4.4.0-176.206
      linux-image-4.4.0-176-powerpc-e500mc  4.4.0-176.206
      linux-image-4.4.0-176-powerpc-smp  4.4.0-176.206
      linux-image-4.4.0-176-powerpc64-emb  4.4.0-176.206
      linux-image-4.4.0-176-powerpc64-smp  4.4.0-176.206
      linux-image-aws                 4.4.0.1104.108
      linux-image-generic             4.4.0.176.184
      linux-image-generic-lpae        4.4.0.176.184
      linux-image-kvm                 4.4.0.1068.68
      linux-image-lowlatency          4.4.0.176.184
      linux-image-powerpc-e500mc      4.4.0.176.184
      linux-image-powerpc-smp         4.4.0.176.184
      linux-image-powerpc64-emb       4.4.0.176.184
      linux-image-powerpc64-smp       4.4.0.176.184
      linux-image-virtual             4.4.0.176.184
    
    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/4303-1
      CVE-2020-2732
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-176.206
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1104.115
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1068.75
    

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