Ubuntu 4116-1: Linux kernel vulnerabilities

    Date02 Sep 2019
    Posted ByLinuxSecurity Advisories
    Ubuntu Large
    Several security issues were fixed in the Linux kernel.
    Ubuntu Security Notice USN-4116-1
    September 02, 2019
    linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 16.04 LTS
    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-kvm: Linux kernel for cloud environments
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    It was discovered that a use-after-free error existed in the block layer
    subsystem of the Linux kernel when certain failure conditions occurred. A
    local attacker could possibly use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2018-20856)
    Amit Klein and Benny Pinkas discovered that the Linux kernel did not
    sufficiently randomize IP ID values generated for connectionless networking
    protocols. A remote attacker could use this to track particular Linux
    devices. (CVE-2019-10638)
    Praveen Pandey discovered that the Linux kernel did not properly validate
    sent signals in some situations on PowerPC systems with transactional
    memory disabled. A local attacker could use this to cause a denial of
    service. (CVE-2019-13648)
    It was discovered that the floppy driver in the Linux kernel did not
    properly validate meta data, leading to a buffer overread. A local attacker
    could use this to cause a denial of service (system crash).
    It was discovered that the floppy driver in the Linux kernel did not
    properly validate ioctl() calls, leading to a division-by-zero. A local
    attacker could use this to cause a denial of service (system crash).
    Jason Wang discovered that an infinite loop vulnerability existed in the
    virtio net driver in the Linux kernel. A local attacker in a guest VM could
    possibly use this to cause a denial of service in the host system.
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1056-kvm      4.4.0-1056.63
      linux-image-4.4.0-1092-aws      4.4.0-1092.103
      linux-image-4.4.0-1120-raspi2   4.4.0-1120.129
      linux-image-4.4.0-1124-snapdragon  4.4.0-1124.130
      linux-image-4.4.0-161-generic   4.4.0-161.189
      linux-image-4.4.0-161-generic-lpae  4.4.0-161.189
      linux-image-4.4.0-161-lowlatency  4.4.0-161.189
      linux-image-4.4.0-161-powerpc-e500mc  4.4.0-161.189
      linux-image-4.4.0-161-powerpc-smp  4.4.0-161.189
      linux-image-4.4.0-161-powerpc64-emb  4.4.0-161.189
      linux-image-4.4.0-161-powerpc64-smp  4.4.0-161.189
    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.
      CVE-2018-20856, CVE-2019-10638, CVE-2019-13648, CVE-2019-14283,
      CVE-2019-14284, CVE-2019-3900
    Package Information:
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