Ubuntu 4096-1: Linux kernel (AWS) vulnerability

    Date13 Aug 2019
    CategoryUbuntu
    1858
    Posted ByLinuxSecurity Advisories
    The system could be made to expose sensitive information.
    ==========================================================================
    Ubuntu Security Notice USN-4096-1
    August 13, 2019
    
    linux-aws, linux-aws-hwe vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.04
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    The system could be made to expose sensitive information.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
    
    Details:
    
    Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors
    incorrectly handle SWAPGS instructions during speculative execution. A
    local attacker could use this to expose sensitive information (kernel
    memory).
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.04:
      linux-image-5.0.0-1012-aws      5.0.0-1012.13
      linux-image-aws                 5.0.0.1012.12
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1045-aws     4.15.0-1045.47
      linux-image-aws                 4.15.0.1045.44
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-1045-aws     4.15.0-1045.47~16.04.1
      linux-image-aws-hwe             4.15.0.1045.45
    
    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/4096-1
      CVE-2019-1125
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1012.13
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1045.47
      https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1045.47~16.04.1
    
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