Ubuntu 4411-1: Linux kernel vulnerabilities

    Date 02 Jul 2020
    123
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4411-1
    July 02, 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 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)
    
    Matthew Sheets discovered that the SELinux network label handling
    implementation in the Linux kernel could be coerced into de-referencing a
    NULL pointer. A remote attacker could use this to cause a denial of service
    (system crash). (CVE-2020-10711)
    
    It was discovered that the SCSI generic (sg) driver in the Linux kernel did
    not properly handle certain error conditions correctly. A local privileged
    attacker could use this to cause a denial of service (system crash).
    (CVE-2020-12770)
    
    It was discovered that the USB Gadget device driver in the Linux kernel did
    not validate arguments passed from configfs in some situations. A local
    attacker could possibly use this to cause a denial of service (system
    crash) or possibly expose sensitive information. (CVE-2020-13143)
    
    It was discovered that the KVM implementation in the Linux kernel did not
    properly deallocate memory on initialization for some processors. A local
    attacker could possibly use this to cause a denial of service.
    (CVE-2020-12768)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
      linux-image-5.4.0-1018-aws      5.4.0-1018.18
      linux-image-5.4.0-1019-gcp      5.4.0-1019.19
      linux-image-5.4.0-1019-oracle   5.4.0-1019.19
      linux-image-5.4.0-28-generic    5.4.0-28.32
      linux-image-5.4.0-40-generic    5.4.0-40.44
      linux-image-5.4.0-40-generic-lpae  5.4.0-40.44
      linux-image-5.4.0-40-lowlatency  5.4.0-40.44
      linux-image-aws                 5.4.0.1018.19
      linux-image-gcp                 5.4.0.1019.17
      linux-image-generic             5.4.0.28.35
      linux-image-generic-lpae        5.4.0.40.43
      linux-image-gke                 5.4.0.1019.17
      linux-image-kvm                 5.4.0.1018.17
      linux-image-lowlatency          5.4.0.40.43
      linux-image-oem                 5.4.0.40.43
      linux-image-oem-osp1            5.4.0.40.43
      linux-image-oracle              5.4.0.1019.17
      linux-image-virtual             5.4.0.28.35
    
    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/4411-1
      CVE-2020-10711, CVE-2020-10732, CVE-2020-12768, CVE-2020-12770,
      CVE-2020-13143
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.4.0-40.44
      https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1018.18
      https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1019.19
      https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1018.18
      https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1019.19
      https://launchpad.net/ubuntu/+source/linux-riscv/5.4.0-28.32
    

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