Ubuntu 4211-1: Linux kernel vulnerabilities

    Date02 Dec 2019
    CategoryUbuntu
    95
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4211-1
    December 03, 2019
    
    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:
    
    Zhipeng Xie discovered that an infinite loop could be triggered in the CFS
    Linux kernel process scheduler. A local attacker could possibly use this to
    cause a denial of service. (CVE-2018-20784)
    
    Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel
    did not properly validate SSID lengths. A physically proximate attacker
    could use this to cause a denial of service (system crash).
    (CVE-2019-17133)
    
    Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux
    kernel performed DMA from a kernel stack. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2019-17075)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1063-kvm      4.4.0-1063.70
      linux-image-4.4.0-1099-aws      4.4.0-1099.110
      linux-image-4.4.0-1126-raspi2   4.4.0-1126.135
      linux-image-4.4.0-1130-snapdragon  4.4.0-1130.138
      linux-image-4.4.0-170-generic   4.4.0-170.199
      linux-image-4.4.0-170-generic-lpae  4.4.0-170.199
      linux-image-4.4.0-170-lowlatency  4.4.0-170.199
      linux-image-4.4.0-170-powerpc-e500mc  4.4.0-170.199
      linux-image-4.4.0-170-powerpc-smp  4.4.0-170.199
      linux-image-4.4.0-170-powerpc64-emb  4.4.0-170.199
      linux-image-4.4.0-170-powerpc64-smp  4.4.0-170.199
      linux-image-aws                 4.4.0.1099.103
      linux-image-generic             4.4.0.170.178
      linux-image-generic-lpae        4.4.0.170.178
      linux-image-kvm                 4.4.0.1063.63
      linux-image-lowlatency          4.4.0.170.178
      linux-image-powerpc-e500mc      4.4.0.170.178
      linux-image-powerpc-smp         4.4.0.170.178
      linux-image-powerpc64-emb       4.4.0.170.178
      linux-image-powerpc64-smp       4.4.0.170.178
      linux-image-raspi2              4.4.0.1126.126
      linux-image-snapdragon          4.4.0.1130.122
      linux-image-virtual             4.4.0.170.178
    
    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/4211-1
      CVE-2018-20784, CVE-2019-17075, CVE-2019-17133
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-170.199
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1099.110
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1063.70
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1126.135
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1130.138
    
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