Ubuntu 4041-2: Linux kernel (HWE) update

    Date28 Jun 2019
    CategoryUbuntu
    3857
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4041-2
    June 29, 2019
    
    linux-lts-xenial, linux-aws, linux-azure update
    ==========================================================================
    
    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-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-4041-1 provided updates for the Linux kernel in Ubuntu.
    This update provides the corresponding updates for the Linux kernel
    for Ubuntu 16.04 ESM.
    
    USN-4017-2 fixed vulnerabilities in the Linux kernel.  Unfortunately,
    the update introduced a regression that interfered with networking
    applications that setup very low SO_SNDBUF values. This update fixes
    the problem.
    
    We apologize for the inconvenience.
    
    Jonathan Looney discovered that the Linux kernel could be coerced into
    segmenting responses into multiple TCP segments. A remote attacker could
    construct an ongoing sequence of requests to cause a denial of service.
    (CVE-2019-11479)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-4.15.0-1049-azure   4.15.0-1049.54~14.04.1
      linux-image-4.4.0-1048-aws      4.4.0-1048.52
      linux-image-4.4.0-154-generic   4.4.0-154.181~14.04.1
      linux-image-4.4.0-154-generic-lpae  4.4.0-154.181~14.04.1
      linux-image-4.4.0-154-lowlatency  4.4.0-154.181~14.04.1
      linux-image-4.4.0-154-powerpc-e500mc  4.4.0-154.181~14.04.1
      linux-image-4.4.0-154-powerpc-smp  4.4.0-154.181~14.04.1
      linux-image-4.4.0-154-powerpc64-emb  4.4.0-154.181~14.04.1
      linux-image-4.4.0-154-powerpc64-smp  4.4.0-154.181~14.04.1
      linux-image-aws                 4.4.0.1048.49
      linux-image-azure               4.15.0.1049.36
      linux-image-generic-lpae-lts-xenial  4.4.0.154.135
      linux-image-generic-lts-xenial  4.4.0.154.135
      linux-image-lowlatency-lts-xenial  4.4.0.154.135
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.154.135
      linux-image-powerpc-smp-lts-xenial  4.4.0.154.135
      linux-image-powerpc64-emb-lts-xenial  4.4.0.154.135
      linux-image-powerpc64-smp-lts-xenial  4.4.0.154.135
      linux-image-virtual-lts-xenial  4.4.0.154.135
    
    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/4041-2
      https://usn.ubuntu.com/4041-1
      CVE-2019-11479, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic
    
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