Linux Security
    Linux Security
    Linux Security

    Ubuntu 4525-1: Linux kernel vulnerabilities

    Date
    182
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4525-1
    September 21, 2020
    
    linux, linux-azure, linux-gcp, linux-oracle vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-oracle: Linux kernel for Oracle Cloud systems
    
    Details:
    
    It was discovered that the AMD Cryptographic Coprocessor device driver in
    the Linux kernel did not properly deallocate memory in some situations. A
    local attacker could use this to cause a denial of service (memory
    exhaustion). (CVE-2019-18808)
    
    It was discovered that the Conexant 23885 TV card device driver for the
    Linux kernel did not properly deallocate memory in some error conditions. A
    local attacker could use this to cause a denial of service (memory
    exhaustion). (CVE-2019-19054)
    
    It was discovered that the VFIO PCI driver in the Linux kernel did not
    properly handle attempts to access disabled memory spaces. A local attacker
    could use this to cause a denial of service (system crash).
    (CVE-2020-12888)
    
    It was discovered that the state of network RNG in the Linux kernel was
    potentially observable. A remote attacker could use this to expose
    sensitive information. (CVE-2020-16166)
    
    It was discovered that the NFS client implementation in the Linux kernel
    did not properly perform bounds checking before copying security labels in
    some situations. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
      linux-image-5.4.0-1025-gcp      5.4.0-1025.25
      linux-image-5.4.0-1025-oracle   5.4.0-1025.25
      linux-image-5.4.0-1026-azure    5.4.0-1026.26
      linux-image-5.4.0-48-generic    5.4.0-48.52
      linux-image-5.4.0-48-generic-lpae  5.4.0-48.52
      linux-image-5.4.0-48-lowlatency  5.4.0-48.52
      linux-image-azure               5.4.0.1026.25
      linux-image-gcp                 5.4.0.1025.22
      linux-image-generic             5.4.0.48.51
      linux-image-generic-lpae        5.4.0.48.51
      linux-image-gke                 5.4.0.1025.22
      linux-image-lowlatency          5.4.0.48.51
      linux-image-oem                 5.4.0.48.51
      linux-image-oem-osp1            5.4.0.48.51
      linux-image-oracle              5.4.0.1025.22
      linux-image-virtual             5.4.0.48.51
    
    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/4525-1
      CVE-2019-18808, CVE-2019-19054, CVE-2020-12888, CVE-2020-16166,
      CVE-2020-25212
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.4.0-48.52
      https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1026.26
      https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1025.25
      https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1025.25
    

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