Ubuntu 3392-1: Linux kernel regression

    Date16 Aug 2017
    CategoryUbuntu
    56
    Posted ByLinuxSecurity Advisories
    USN-3378-1 introduced a regression in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3392-1
    August 16, 2017
    
    linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon regression
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    USN-3378-1 introduced a regression in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-gke: Linux kernel for Google Container Engine (GKE) systems
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    
    Details:
    
    USN-3378-1 fixed vulnerabilities in the Linux kernel. Unfortunately, a
    regression was introduced that prevented conntrack from working
    correctly in some situations. This update fixes the problem.
    
    We apologize for the inconvenience.
    
    Original advisory details:
    
     Fan Wu and Shixiong Zhao discovered a race condition between inotify events
     and vfs rename operations in the Linux kernel. An unprivileged local
     attacker could use this to cause a denial of service (system crash) or
     execute arbitrary code. (CVE-2017-7533)
    
     It was discovered that the Linux kernel did not properly restrict
     RLIMIT_STACK size. A local attacker could use this in conjunction with
     another vulnerability to possibly execute arbitrary code.
     (CVE-2017-1000365)
    
     李强 discovered that the Virtio GPU driver in the Linux kernel did not
     properly free memory in some situations. A local attacker could use this to
     cause a denial of service (memory consumption). (CVE-2017-10810)
    
     石磊 discovered that the RxRPC Kerberos 5 ticket handling code in the
     Linux kernel did not properly verify metadata. A remote attacker could use
     this to cause a denial of service (system crash) or possibly execute
     arbitrary code. (CVE-2017-7482)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1027-gke      4.4.0-1027.27
      linux-image-4.4.0-1031-aws      4.4.0-1031.40
      linux-image-4.4.0-1070-raspi2   4.4.0-1070.78
      linux-image-4.4.0-1072-snapdragon  4.4.0-1072.77
      linux-image-4.4.0-92-generic    4.4.0-92.115
      linux-image-4.4.0-92-generic-lpae  4.4.0-92.115
      linux-image-4.4.0-92-lowlatency  4.4.0-92.115
      linux-image-4.4.0-92-powerpc-e500mc  4.4.0-92.115
      linux-image-4.4.0-92-powerpc-smp  4.4.0-92.115
      linux-image-4.4.0-92-powerpc64-emb  4.4.0-92.115
      linux-image-4.4.0-92-powerpc64-smp  4.4.0-92.115
      linux-image-aws                 4.4.0.1031.33
      linux-image-generic             4.4.0.92.97
      linux-image-generic-lpae        4.4.0.92.97
      linux-image-gke                 4.4.0.1027.28
      linux-image-lowlatency          4.4.0.92.97
      linux-image-powerpc-e500mc      4.4.0.92.97
      linux-image-powerpc-smp         4.4.0.92.97
      linux-image-powerpc64-emb       4.4.0.92.97
      linux-image-powerpc64-smp       4.4.0.92.97
      linux-image-raspi2              4.4.0.1070.70
      linux-image-snapdragon          4.4.0.1072.64
    
    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://www.ubuntu.com/usn/usn-3392-1
      https://bugs.launchpad.net/bugs/1709032, https://usn.ubuntu.com/usn/usn-3378-1
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-92.115
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1031.40
      https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1027.27
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1070.78
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1072.77
    
    
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