Ubuntu 4253-2: Linux kernel (HWE) vulnerability

    Date 28 Jan 2020
    542
    Posted By LinuxSecurity Advisories
    he Linux kernel could be made to expose sensitive information.
    ==========================================================================
    Ubuntu Security Notice USN-4253-2
    January 28, 2020
    
    linux-hwe vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    he Linux kernel could be made to expose sensitive information.
    
    Software Description:
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    USN-4253-1 fixed vulnerabilities in the Linux kernel for Ubuntu 19.10.
    This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 19.10 for Ubuntu
    18.04 LTS.
    
    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.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-5.3.0-28-generic    5.3.0-28.30~18.04.1
      linux-image-5.3.0-28-generic-lpae  5.3.0-28.30~18.04.1
      linux-image-5.3.0-28-lowlatency  5.3.0-28.30~18.04.1
      linux-image-generic-hwe-18.04   5.3.0.28.96
      linux-image-generic-lpae-hwe-18.04  5.3.0.28.96
      linux-image-lowlatency-hwe-18.04  5.3.0.28.96
      linux-image-snapdragon-hwe-18.04  5.3.0.28.96
      linux-image-virtual-hwe-18.04   5.3.0.28.96
    
    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/4253-2
      https://usn.ubuntu.com/4253-1
      CVE-2019-14615
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-28.30~18.04.1
    

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