Ubuntu 4211-2: Linux kernel (Xenial HWE) vulnerabilities

    Date02 Dec 2019
    CategoryUbuntu
    97
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4211-2
    December 03, 2019
    
    linux-lts-xenial, linux-aws vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-4211-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
    14.04 ESM.
    
    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 14.04 ESM:
      linux-image-4.4.0-1059-aws      4.4.0-1059.63
      linux-image-4.4.0-170-generic   4.4.0-170.199~14.04.1
      linux-image-4.4.0-170-generic-lpae  4.4.0-170.199~14.04.1
      linux-image-4.4.0-170-lowlatency  4.4.0-170.199~14.04.1
      linux-image-4.4.0-170-powerpc-e500mc  4.4.0-170.199~14.04.1
      linux-image-4.4.0-170-powerpc-smp  4.4.0-170.199~14.04.1
      linux-image-4.4.0-170-powerpc64-emb  4.4.0-170.199~14.04.1
      linux-image-4.4.0-170-powerpc64-smp  4.4.0-170.199~14.04.1
      linux-image-aws                 4.4.0.1059.60
      linux-image-generic-lpae-lts-xenial  4.4.0.170.149
      linux-image-generic-lts-xenial  4.4.0.170.149
      linux-image-lowlatency-lts-xenial  4.4.0.170.149
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.170.149
      linux-image-powerpc-smp-lts-xenial  4.4.0.170.149
      linux-image-powerpc64-emb-lts-xenial  4.4.0.170.149
      linux-image-powerpc64-smp-lts-xenial  4.4.0.170.149
      linux-image-virtual-lts-xenial  4.4.0.170.149
    
    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/4211-2
      https://usn.ubuntu.com/4211-1
      CVE-2018-20784, CVE-2019-17075, CVE-2019-17133
    
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