Linux Security
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    Linux Security

    Ubuntu 4367-1: Linux kernel vulnerabilities

    Date
    182
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4367-1
    May 19, 2020
    
    linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-riscv
    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-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-oracle: Linux kernel for Oracle Cloud systems
    - linux-riscv: Linux kernel for RISC-V systems
    
    Details:
    
    It was discovered that the btrfs implementation in the Linux kernel did not
    properly detect that a block was marked dirty in some situations. An
    attacker could use this to specially craft a file system image that, when
    unmounted, could cause a denial of service (system crash). (CVE-2019-19377)
    
    It was discovered that the linux kernel did not properly validate certain
    mount options to the tmpfs virtual memory file system. A local attacker
    with the ability to specify mount options could use this to cause a denial
    of service (system crash). (CVE-2020-11565)
    
    It was discovered that the block layer in the Linux kernel contained a race
    condition leading to a use-after-free vulnerability. A local attacker could
    possibly use this to cause a denial of service (system crash) or execute
    arbitrary code. (CVE-2020-12657)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
      linux-image-5.4.0-1011-aws      5.4.0-1011.11
      linux-image-5.4.0-1011-gcp      5.4.0-1011.11
      linux-image-5.4.0-1011-kvm      5.4.0-1011.11
      linux-image-5.4.0-1011-oracle   5.4.0-1011.11
      linux-image-5.4.0-26-generic    5.4.0-26.30
      linux-image-5.4.0-31-generic    5.4.0-31.35
      linux-image-5.4.0-31-generic-lpae  5.4.0-31.35
      linux-image-5.4.0-31-lowlatency  5.4.0-31.35
      linux-image-aws                 5.4.0.1011.14
      linux-image-gcp                 5.4.0.1011.12
      linux-image-generic             5.4.0.26.33
      linux-image-generic-lpae        5.4.0.31.36
      linux-image-gke                 5.4.0.1011.12
      linux-image-kvm                 5.4.0.1011.12
      linux-image-lowlatency          5.4.0.31.36
      linux-image-oem                 5.4.0.31.36
      linux-image-oem-osp1            5.4.0.31.36
      linux-image-oracle              5.4.0.1011.12
      linux-image-virtual             5.4.0.26.33
    
    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/4367-1
      CVE-2019-19377, CVE-2020-11565, CVE-2020-12657
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.4.0-31.35
      https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1011.11
      https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1011.11
      https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1011.11
      https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1011.11
      https://launchpad.net/ubuntu/+source/linux-riscv/5.4.0-26.30
    

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