Ubuntu 4439-1: Linux kernel vulnerabilities

    Date 27 Jul 2020
    129
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4439-1
    July 27, 2020
    
    linux-gke-5.0, linux-oem-osp1 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-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
    - linux-oem-osp1: Linux kernel for OEM systems
    
    Details:
    
    It was discovered that the network block device (nbd) implementation in the
    Linux kernel did not properly check for error conditions in some
    situations. An attacker could possibly use this to cause a denial of
    service (system crash). (CVE-2019-16089)
    
    It was discovered that the btrfs file system implementation in the Linux
    kernel did not properly validate file system metadata in some situations.
    An attacker could use this to construct a malicious btrfs image that, when
    mounted, could cause a denial of service (system crash). (CVE-2019-19036)
    
    It was discovered that the kernel->user space relay implementation in the
    Linux kernel did not properly check return values in some situations. A
    local attacker could possibly use this to cause a denial of service (system
    crash). (CVE-2019-19462)
    
    Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
    kernel did not properly deallocate memory in some failure conditions. A
    physically proximate attacker could use this to cause a denial of service
    (memory exhaustion). (CVE-2019-20810)
    
    It was discovered that the elf handling code in the Linux kernel did not
    initialize memory before using it in certain situations. A local attacker
    could use this to possibly expose sensitive information (kernel memory).
    (CVE-2020-10732)
    
    Fan Yang discovered that the mremap implementation in the Linux kernel did
    not properly handle DAX Huge Pages. A local attacker with access to DAX
    storage could use this to gain administrative privileges. (CVE-2020-10757)
    
    It was discovered that the Linux kernel did not correctly apply Speculative
    Store Bypass Disable (SSBD) mitigations in certain situations. A local
    attacker could possibly use this to expose sensitive information.
    (CVE-2020-10766)
    
    It was discovered that the Linux kernel did not correctly apply Indirect
    Branch Predictor Barrier (IBPB) mitigations in certain situations. A local
    attacker could possibly use this to expose sensitive information.
    (CVE-2020-10767)
    
    It was discovered that the Linux kernel could incorrectly enable indirect
    branch speculation after it has been disabled for a process via a prctl()
    call. A local attacker could possibly use this to expose sensitive
    information. (CVE-2020-10768)
    
    Mauricio Faria de Oliveira discovered that the aufs implementation in the
    Linux kernel improperly managed inode reference counts in the
    vfsub_dentry_open() method. A local attacker could use this vulnerability
    to cause a denial of service. (CVE-2020-11935)
    
    It was discovered that the Virtual Terminal keyboard driver in the Linux
    kernel contained an integer overflow. A local attacker could possibly use
    this to have an unspecified impact. (CVE-2020-13974)
    
    It was discovered that the efi subsystem in the Linux kernel did not handle
    memory allocation failures during early boot in some situations. A local
    attacker could possibly use this to cause a denial of service (system
    crash). (CVE-2019-12380)
    
    Jason A. Donenfeld discovered that the ACPI implementation in the Linux
    kernel did not properly restrict loading SSDT code from an EFI variable.
    A privileged attacker could use this to bypass Secure Boot lockdown
    restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)
    
    Jason A. Donenfeld discovered that the ACPI implementation in the Linux
    kernel did not properly restrict loading ACPI tables via configfs. A
    privileged attacker could use this to bypass Secure Boot lockdown
    restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-5.0.0-1045-gke      5.0.0-1045.46
      linux-image-5.0.0-1065-oem-osp1  5.0.0-1065.70
      linux-image-gke-5.0             5.0.0.1045.30
      linux-image-oem-osp1            5.0.0.1065.63
    
    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/4439-1
      CVE-2019-12380, CVE-2019-16089, CVE-2019-19036, CVE-2019-19462,
      CVE-2019-20810, CVE-2019-20908, CVE-2020-10732, CVE-2020-10757,
      CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-11935,
      CVE-2020-13974, CVE-2020-15780
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1045.46
      https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1065.70
    

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