Linux Security
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    Ubuntu 4255-1: Linux kernel vulnerabilities

    Date
    376
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4255-1
    January 28, 2020
    
    linux, linux-aws, linux-oem vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-oem: Linux kernel for OEM processors
    
    Details:
    
    It was discovered that the Linux kernel did not properly clear data
    structures on context switches for certain Intel graphics processors. A
    local attacker could use this to expose sensitive information.
    (CVE-2019-14615)
    
    It was discovered that a race condition can lead to a use-after-free while
    destroying GEM contexts in the i915 driver for the Linux kernel. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2020-7053)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1058-aws     4.15.0-1058.60
      linux-image-4.15.0-1067-oem     4.15.0-1067.77
      linux-image-4.15.0-76-generic   4.15.0-76.86
      linux-image-4.15.0-76-generic-lpae  4.15.0-76.86
      linux-image-4.15.0-76-lowlatency  4.15.0-76.86
      linux-image-aws                 4.15.0.1058.59
      linux-image-aws-lts-18.04       4.15.0.1058.59
      linux-image-generic             4.15.0.76.78
      linux-image-generic-lpae        4.15.0.76.78
      linux-image-lowlatency          4.15.0.76.78
      linux-image-oem                 4.15.0.1067.71
      linux-image-powerpc-e500mc      4.15.0.76.78
      linux-image-powerpc-smp         4.15.0.76.78
      linux-image-powerpc64-emb       4.15.0.76.78
      linux-image-powerpc64-smp       4.15.0.76.78
      linux-image-virtual             4.15.0.76.78
    
    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/4255-1
      CVE-2019-14615, CVE-2020-7053
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.15.0-76.86
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1058.60
      https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1067.77
    

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