Ubuntu 4303-2: Linux kernel (HWE) vulnerability

    Date 16 Mar 2020
    470
    Posted By LinuxSecurity Advisories
    The system could be made to expose sensitive information.
    ==========================================================================
    Ubuntu Security Notice USN-4303-2
    March 17, 2020
    
    linux-lts-xenial, linux-aws vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    
    Summary:
    
    The system could be made to expose sensitive information.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-4303-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
    14.04 ESM.
    
    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 14.04 ESM:
      linux-image-4.4.0-1064-aws      4.4.0-1064.68
      linux-image-4.4.0-176-generic   4.4.0-176.206~14.04.1
      linux-image-4.4.0-176-generic-lpae  4.4.0-176.206~14.04.1
      linux-image-4.4.0-176-lowlatency  4.4.0-176.206~14.04.1
      linux-image-4.4.0-176-powerpc-e500mc  4.4.0-176.206~14.04.1
      linux-image-4.4.0-176-powerpc-smp  4.4.0-176.206~14.04.1
      linux-image-4.4.0-176-powerpc64-emb  4.4.0-176.206~14.04.1
      linux-image-4.4.0-176-powerpc64-smp  4.4.0-176.206~14.04.1
      linux-image-aws                 4.4.0.1064.65
      linux-image-generic-lpae-lts-xenial  4.4.0.176.155
      linux-image-generic-lts-xenial  4.4.0.176.155
      linux-image-lowlatency-lts-xenial  4.4.0.176.155
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.176.155
      linux-image-powerpc-smp-lts-xenial  4.4.0.176.155
      linux-image-powerpc64-emb-lts-xenial  4.4.0.176.155
      linux-image-powerpc64-smp-lts-xenial  4.4.0.176.155
      linux-image-virtual-lts-xenial  4.4.0.176.155
    
    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/4303-2
      https://usn.ubuntu.com/4303-1
      CVE-2020-2732
    

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