Ubuntu 3901-1: Linux kernel vulnerabilities

    Date05 Mar 2019
    CategoryUbuntu
    2788
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3901-1
    March 05, 2019
    
    linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-oem: Linux kernel for OEM processors
    - linux-oracle: Linux kernel for Oracle Cloud systems
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    Jann Horn discovered that the userfaultd implementation in the Linux kernel
    did not properly restrict access to certain ioctls. A local attacker could
    use this possibly to modify files. (CVE-2018-18397)
    
    It was discovered that the crypto subsystem of the Linux kernel leaked
    uninitialized memory to user space in some situations. A local attacker
    could use this to expose sensitive information (kernel memory).
    (CVE-2018-19854)
    
    Jann Horn discovered a race condition in the fork() system call in
    the Linux kernel. A local attacker could use this to gain access to
    services that cache authorizations. (CVE-2019-6133)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1009-oracle  4.15.0-1009.11
      linux-image-4.15.0-1028-gcp     4.15.0-1028.29
      linux-image-4.15.0-1030-kvm     4.15.0-1030.30
      linux-image-4.15.0-1032-raspi2  4.15.0-1032.34
      linux-image-4.15.0-1033-aws     4.15.0-1033.35
      linux-image-4.15.0-1034-oem     4.15.0-1034.39
      linux-image-4.15.0-46-generic   4.15.0-46.49
      linux-image-4.15.0-46-generic-lpae  4.15.0-46.49
      linux-image-4.15.0-46-lowlatency  4.15.0-46.49
      linux-image-4.15.0-46-snapdragon  4.15.0-46.49
      linux-image-aws                 4.15.0.1033.32
      linux-image-gcp                 4.15.0.1028.30
      linux-image-generic             4.15.0.46.48
      linux-image-generic-lpae        4.15.0.46.48
      linux-image-gke                 4.15.0.1028.30
      linux-image-kvm                 4.15.0.1030.30
      linux-image-lowlatency          4.15.0.46.48
      linux-image-oem                 4.15.0.1034.39
      linux-image-oracle              4.15.0.1009.12
      linux-image-raspi2              4.15.0.1032.30
      linux-image-snapdragon          4.15.0.46.48
    
    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-3901-1
      CVE-2018-18397, CVE-2018-19854, CVE-2019-6133
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.15.0-46.49
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1033.35
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1028.29
      https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1030.30
      https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1034.39
      https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1009.11
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1032.34
    
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