Linux Security
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    Ubuntu 4254-1: Linux kernel vulnerabilities

    Date
    324
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4254-1
    January 28, 2020
    
    linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon
    vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 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-kvm: Linux kernel for cloud environments
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    
    Details:
    
    It was discovered that the Linux kernel did not properly clear data
    structures on context switches for certain Intel graphics processors. A
    local attacker could use this to expose sensitive information.
    (CVE-2019-14615)
    
    It was discovered that a race condition existed in the Virtual Video Test
    Driver in the Linux kernel. An attacker with write access to /dev/video0 on
    a system with the vivid module loaded could possibly use this to gain
    administrative privileges. (CVE-2019-18683)
    
    It was discovered that the btrfs file system in the Linux kernel did not
    properly validate metadata, leading to a NULL pointer dereference. An
    attacker could use this to specially craft a file system image that, when
    mounted, could cause a denial of service (system crash). (CVE-2019-18885)
    
    It was discovered that multiple memory leaks existed in the Marvell WiFi-Ex
    Driver for the Linux kernel. A local attacker could possibly use this to
    cause a denial of service (kernel memory exhaustion). (CVE-2019-19057)
    
    It was discovered that the crypto subsystem in the Linux kernel did not
    properly deallocate memory in certain error conditions. A local attacker
    could use this to cause a denial of service (kernel memory exhaustion).
    (CVE-2019-19062)
    
    It was discovered that the Realtek rtlwifi USB device driver in the Linux
    kernel did not properly deallocate memory in certain error conditions. A
    local attacker could possibly use this to cause a denial of service (kernel
    memory exhaustion). (CVE-2019-19063)
    
    Dan Carpenter discovered that the AppleTalk networking subsystem of the
    Linux kernel did not properly handle certain error conditions, leading to a
    NULL pointer dereference. A local attacker could use this to cause a denial
    of service (system crash). (CVE-2019-19227)
    
    It was discovered that the KVM hypervisor implementation in the Linux
    kernel did not properly handle ioctl requests to get emulated CPUID
    features. An attacker with access to /dev/kvm could use this to cause a
    denial of service (system crash). (CVE-2019-19332)
    
    It was discovered that the B2C2 FlexCop USB device driver in the Linux
    kernel did not properly validate device metadata. A physically proximate
    attacker could use this to cause a denial of service (system crash).
    (CVE-2019-15291)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1065-kvm      4.4.0-1065.72
      linux-image-4.4.0-1101-aws      4.4.0-1101.112
      linux-image-4.4.0-1128-raspi2   4.4.0-1128.137
      linux-image-4.4.0-1132-snapdragon  4.4.0-1132.140
      linux-image-4.4.0-173-generic   4.4.0-173.203
      linux-image-4.4.0-173-generic-lpae  4.4.0-173.203
      linux-image-4.4.0-173-lowlatency  4.4.0-173.203
      linux-image-4.4.0-173-powerpc-e500mc  4.4.0-173.203
      linux-image-4.4.0-173-powerpc-smp  4.4.0-173.203
      linux-image-4.4.0-173-powerpc64-emb  4.4.0-173.203
      linux-image-4.4.0-173-powerpc64-smp  4.4.0-173.203
      linux-image-aws                 4.4.0.1101.105
      linux-image-generic             4.4.0.173.181
      linux-image-generic-lpae        4.4.0.173.181
      linux-image-kvm                 4.4.0.1065.65
      linux-image-lowlatency          4.4.0.173.181
      linux-image-powerpc-e500mc      4.4.0.173.181
      linux-image-powerpc-smp         4.4.0.173.181
      linux-image-powerpc64-emb       4.4.0.173.181
      linux-image-powerpc64-smp       4.4.0.173.181
      linux-image-raspi2              4.4.0.1128.128
      linux-image-snapdragon          4.4.0.1132.124
      linux-image-virtual             4.4.0.173.181
    
    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/4254-1
      CVE-2019-14615, CVE-2019-15291, CVE-2019-18683, CVE-2019-18885,
      CVE-2019-19057, CVE-2019-19062, CVE-2019-19063, CVE-2019-19227,
      CVE-2019-19332
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-173.203
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1101.112
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1065.72
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1128.137
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1132.140
    

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