Ubuntu 4412-1: Linux kernel vulnerabilities

    Date 02 Jul 2020
    103
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4412-1
    July 02, 2020
    
    linux, linux-azure, linux-gcp, linux-gcp-5.3, linux-hwe, linux-kvm,
    linux-oracle, linux-oracle-5.3 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.10
    - Ubuntu 18.04 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-kvm: Linux kernel for cloud environments
    - linux-oracle: Linux kernel for Oracle Cloud systems
    - linux-gcp-5.3: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-hwe: Linux hardware enablement (HWE) kernel
    - linux-oracle-5.3: Linux kernel for Oracle Cloud systems
    
    Details:
    
    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)
    
    Dmitry Vyukov discovered that the SELinux netlink security hook in the
    Linux kernel did not validate messages in some situations. A privileged
    attacker could use this to bypass SELinux netlink restrictions.
    (CVE-2020-10751)
    
    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 19.10:
      linux-image-5.3.0-1024-kvm      5.3.0-1024.26
      linux-image-5.3.0-1028-oracle   5.3.0-1028.30
      linux-image-5.3.0-1030-gcp      5.3.0-1030.32
      linux-image-5.3.0-1031-azure    5.3.0-1031.32
      linux-image-5.3.0-62-generic    5.3.0-62.56
      linux-image-5.3.0-62-generic-lpae  5.3.0-62.56
      linux-image-5.3.0-62-lowlatency  5.3.0-62.56
      linux-image-5.3.0-62-snapdragon  5.3.0-62.56
      linux-image-azure               5.3.0.1031.49
      linux-image-gcp                 5.3.0.1030.40
      linux-image-generic             5.3.0.62.52
      linux-image-generic-lpae        5.3.0.62.52
      linux-image-gke                 5.3.0.1030.40
      linux-image-kvm                 5.3.0.1024.22
      linux-image-lowlatency          5.3.0.62.52
      linux-image-oracle              5.3.0.1028.43
      linux-image-snapdragon          5.3.0.62.52
      linux-image-virtual             5.3.0.62.52
    
    Ubuntu 18.04 LTS:
      linux-image-5.3.0-1028-oracle   5.3.0-1028.30~18.04.1
      linux-image-5.3.0-1030-gcp      5.3.0-1030.32~18.04.1
      linux-image-5.3.0-62-generic    5.3.0-62.56~18.04.1
      linux-image-5.3.0-62-generic-lpae  5.3.0-62.56~18.04.1
      linux-image-5.3.0-62-lowlatency  5.3.0-62.56~18.04.1
      linux-image-gcp                 5.3.0.1030.24
      linux-image-generic-hwe-18.04   5.3.0.62.115
      linux-image-generic-lpae-hwe-18.04  5.3.0.62.115
      linux-image-gkeop-5.3           5.3.0.62.115
      linux-image-lowlatency-hwe-18.04  5.3.0.62.115
      linux-image-oracle              5.3.0.1028.25
      linux-image-snapdragon-hwe-18.04  5.3.0.62.115
      linux-image-virtual-hwe-18.04   5.3.0.62.115
    
    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/4412-1
      CVE-2020-10711, CVE-2020-10751, CVE-2020-12768, CVE-2020-12770,
      CVE-2020-13143
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.3.0-62.56
      https://launchpad.net/ubuntu/+source/linux-azure/5.3.0-1031.32
      https://launchpad.net/ubuntu/+source/linux-gcp/5.3.0-1030.32
      https://launchpad.net/ubuntu/+source/linux-kvm/5.3.0-1024.26
      https://launchpad.net/ubuntu/+source/linux-oracle/5.3.0-1028.30
      https://launchpad.net/ubuntu/+source/linux-gcp-5.3/5.3.0-1030.32~18.04.1
      https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-62.56~18.04.1
      https://launchpad.net/ubuntu/+source/linux-oracle-5.3/5.3.0-1028.30~18.04.1
    

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