Ubuntu 3740-1: Linux kernel vulnerabilities

    Date14 Aug 2018
    CategoryUbuntu
    2612
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3740-1
    August 14, 2018
    
    linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, and
    linux-raspi2 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-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-oem: Linux kernel for OEM processors
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    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)
    
    Juha-Matti Tilli discovered that the IP implementation in the Linux kernel
    performed algorithmically expensive operations in some situations when
    handling incoming packet fragments. A remote attacker could use this to
    cause a denial of service. (CVE-2018-5391)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1015-oem     4.15.0.1015.17
      linux-image-4.15.0-1017-gcp     4.15.0-1017.18
      linux-image-4.15.0-1019-aws     4.15.0-1019.19
      linux-image-4.15.0-1019-kvm     4.15.0-1019.19
      linux-image-4.15.0-1020-raspi2  4.15.0-1020.22
      linux-image-4.15.0-1021-azure   4.15.0.1021.21
      linux-image-4.15.0-32-generic   4.15.0-32.35
      linux-image-4.15.0-32-generic-lpae  4.15.0-32.35
      linux-image-4.15.0-32-lowlatency  4.15.0-32.35
      linux-image-4.15.0-32-snapdragon  4.15.0-32.35
      linux-image-aws                 4.15.0.1019.19
      linux-image-azure               4.15.0.1021.21
      linux-image-azure-edge          4.15.0.1021.21
      linux-image-gcp                 4.15.0.1017.19
      linux-image-generic             4.15.0.32.34
      linux-image-generic-lpae        4.15.0.32.34
      linux-image-gke                 4.15.0.1017.19
      linux-image-kvm                 4.15.0.1019.19
      linux-image-lowlatency          4.15.0.32.34
      linux-image-oem                 4.15.0.1015.17
      linux-image-raspi2              4.15.0.1020.18
      linux-image-snapdragon          4.15.0.32.34
    
    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-3740-1
      CVE-2018-3620, CVE-2018-3646, CVE-2018-5391,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.15.0-32.35
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1019.19
      https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1021.21
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1017.18
      https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1019.19
      https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1015.18
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1020.22
    
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