Ubuntu 4325-1: Linux kernel vulnerabilities

    Date 07 Apr 2020
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    Ubuntu Security Notice USN-4325-1
    April 07, 2020
    linux-azure, linux-gcp, linux-gke-5.0, linux-oem-osp1, linux-oracle-5.0
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 18.04 LTS
    Several security issues were fixed in the Linux kernel.
    Software Description:
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
    - linux-oem-osp1: Linux kernel for OEM processors
    - linux-oracle-5.0: Linux kernel for Oracle Cloud systems
    It was discovered that the IPMI message handler implementation in the Linux
    kernel did not properly deallocate memory in certain situations. A local
    attacker could use this to cause a denial of service (kernel memory
    exhaustion). (CVE-2019-19046)
    Al Viro discovered that the vfs layer in the Linux kernel contained a use-
    after-free vulnerability. A local attacker could use this to cause a denial
    of service (system crash) or possibly expose sensitive information (kernel
    memory). (CVE-2020-8428)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 18.04 LTS:
      linux-image-5.0.0-1014-oracle   5.0.0-1014.19
      linux-image-5.0.0-1033-gke      5.0.0-1033.34
      linux-image-5.0.0-1034-gcp      5.0.0-1034.35
      linux-image-5.0.0-1036-azure    5.0.0-1036.38
      linux-image-5.0.0-1047-oem-osp1  5.0.0-1047.52
    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-2019-19046, CVE-2020-8428
    Package Information:

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