Ubuntu 3392-2: Linux kernel (Xenial HWE) regression

    Date16 Aug 2017
    CategoryUbuntu
    55
    Posted ByLinuxSecurity Advisories
    USN-3378-2 introduced a regression the Linux Hardware Enablement kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3392-2
    August 16, 2017
    
    linux-lts-xenial regression
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    USN-3378-2 introduced a regression the Linux Hardware Enablement
    kernel.
    
    Software Description:
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-3392-1 fixed a regression 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 LTS.
    
    USN-3378-2 fixed vulnerabilities in the Linux Hardware Enablement
    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 14.04 LTS:
      linux-image-4.4.0-92-generic    4.4.0-92.115~14.04.1
      linux-image-4.4.0-92-generic-lpae  4.4.0-92.115~14.04.1
      linux-image-4.4.0-92-lowlatency  4.4.0-92.115~14.04.1
      linux-image-4.4.0-92-powerpc-e500mc  4.4.0-92.115~14.04.1
      linux-image-4.4.0-92-powerpc-smp  4.4.0-92.115~14.04.1
      linux-image-4.4.0-92-powerpc64-emb  4.4.0-92.115~14.04.1
      linux-image-4.4.0-92-powerpc64-smp  4.4.0-92.115~14.04.1
      linux-image-generic-lpae-lts-xenial  4.4.0.92.76
      linux-image-generic-lts-xenial  4.4.0.92.76
      linux-image-lowlatency-lts-xenial  4.4.0.92.76
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.92.76
      linux-image-powerpc-smp-lts-xenial  4.4.0.92.76
      linux-image-powerpc64-emb-lts-xenial  4.4.0.92.76
      linux-image-powerpc64-smp-lts-xenial  4.4.0.92.76
    
    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-3392-2
      https://www.ubuntu.com/usn/usn-3392-1
      https://bugs.launchpad.net/bugs/1709032, https://usn.ubuntu.com/usn/usn-3378-2
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-92.115~14.04.1
    
    
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