Ubuntu 3823-1: Linux kernel vulnerabilities

    Date15 Nov 2018
    CategoryUbuntu
    4512
    Posted ByAnthony Pell
    Several security issues were mitigated in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3823-1
    November 15, 2018
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were mitigated in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    It was discovered that memory present in the L1 data cache of an Intel CPU
    core may be exposed to a malicious process that is executing on the CPU
    core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
    attacker in a guest virtual machine could use this to expose sensitive
    information (memory from other guests or the host OS). (CVE-2018-3646)
    
    It was discovered that memory present in the L1 data cache of an Intel CPU
    core may be exposed to a malicious process that is executing on the CPU
    core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
    attacker could use this to expose sensitive information (memory from the
    kernel or other processes). (CVE-2018-3620)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      linux-image-3.2.0-137-generic   3.2.0-137.183
      linux-image-3.2.0-137-generic-pae  3.2.0-137.183
      linux-image-3.2.0-137-highbank  3.2.0-137.183
      linux-image-3.2.0-137-omap      3.2.0-137.183
      linux-image-3.2.0-137-powerpc-smp  3.2.0-137.183
      linux-image-3.2.0-137-powerpc64-smp  3.2.0-137.183
      linux-image-3.2.0-137-virtual   3.2.0-137.183
      linux-image-generic             3.2.0.137.152
      linux-image-generic-pae         3.2.0.137.152
      linux-image-highbank            3.2.0.137.152
      linux-image-omap                3.2.0.137.152
      linux-image-powerpc             3.2.0.137.152
      linux-image-powerpc-smp         3.2.0.137.152
      linux-image-powerpc64-smp       3.2.0.137.152
      linux-image-virtual             3.2.0.137.152
    
    Please note that the recommended mitigation for CVE-2018-3646 involves
    updating processor microcode in addition to updating the kernel;
    however, the kernel includes a fallback for processors that have not
    received microcode updates.
    
    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/usn/usn-3823-1
      CVE-2018-3620, CVE-2018-3646,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
    
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