Linux Security
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    Ubuntu 0059-1: Linux kernel vulnerability

    Date 12 Nov 2019
    298
    Posted By LinuxSecurity Advisories
    On November 12, fixes for several high-severity Intel processor CVEs were released into the Ubuntu kernel, accompanied by a related processor microcode update. Due to the high complexity of the fixes and the required microcode update, we are unable to livepatch this set of CVEs. Please plan to reboot [More...]
    ==========================================================================
    Kernel Live Patch Security Notice 0059-1
    November 12, 2019
    
    linux vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu:
    
    | Series           | Base kernel  | Arch     | flavors          |
    |------------------+--------------+----------+------------------|
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | aws              |
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | oem              |
    | Ubuntu 18.04 LTS | 5.0.0        | amd64    | azure            |
    | Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | aws              |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
    | Ubuntu 16.04 LTS | 4.15.0       | amd64    | azure            |
    | Ubuntu 16.04 LTS | 4.15.0       | amd64    | generic          |
    | Ubuntu 16.04 LTS | 4.15.0       | amd64    | lowlatency       |
    
    Summary:
    
    On November 12, fixes for several high-severity Intel processor CVEs were 
    released into the Ubuntu kernel, accompanied by a related processor microcode
    update. Due to the high complexity of the fixes and the required microcode 
    update, we are unable to livepatch this set of CVEs. Please plan to reboot 
    into an updated kernel as soon as possible.
    
    The details of these CVEs follows:
    
    CVE-2018-12207
    
      On an Ubuntu KVM host configured to use huge pages, a malicious KVM guest
      can cause a host machine check exception (MCE) capable of bringing down
      the host OS.
    
    CVE-2019-0154
    
      On Intel processors containing an i915 graphics processing unit, it is
      possible from userspace to cause a GPU hang in certain low-power states by
      reading a specific memory-mapped IO register.
      
    CVE-2019-0155
    
      On Intel processors containing an i915 graphics processing unit, it is
      possible to use the GPU's blitter command streamer to write to
      memory-mapped IO locations, which could be used for privilege escalation
      or to leak kernel memory.
    
    CVE-2019-11135
    
      On Intel processors with support for Transactional Synchronization 
      Extensions (TSX), it is possible to exploit a transactional asynchronous
      abort (TAA) to perform a side-channel attack and leak kernel memory.
    
    Further details on the vulnerabilities and our response can be found here:
    https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/TAA_MCEPSC_i915
    
    Again, due to the high complexity of the fixes and the required microcode 
    update, we are unable to livepatch this set of CVEs. Please plan to reboot 
    into an updated kernel as soon as possible.
    
    Software Description:
    - linux: Linux kernel
    
    Update instructions:
    
    The problem can be corrected by installing an updated kernel with these
    fixes and rebooting.
    
    | Series           | Version               | Flavors                  |
    |------------------+-----------------------+--------------------------|
    | Ubuntu 18.04 LTS | 4.15.0-1054.55        | aws                      |
    | Ubuntu 16.04 LTS | 4.4.0-1098.102        | aws                      |
    | Ubuntu 18.04 LTS | 5.0.0-1025.27~18.04.1 | azure                    |
    | Ubuntu 16.04 LTS | 4.15.0-1063.66        | azure                    |
    | Ubuntu 18.04 LTS | 4.15.0-69.78          | generic lowlatency       |
    | Ubuntu 16.04 LTS | 4.15.0-69.78~16.04.1  | generic lowlatency       |
    | Ubuntu 14.04 LTS | 4.4.0-168.197~14.04.1 | generic lowlatency       |
    | Ubuntu 18.04 LTS | 4.15.0-1063.72        | oem                      |
    | Ubuntu 16.04 LTS | 4.4.0-168.197         | generic lowlatency       |
    
    Support Information:
    
    Kernels older than the levels listed above will no longer receive livepatch
    updates.
    
    References:
    CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135
    
    
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