Ubuntu 3378-2: Linux kernel (Xenial HWE) vulnerabilities

    Date03 Aug 2017
    CategoryUbuntu
    54
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3378-2
    August 03, 2017
    
    linux-lts-xenial vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-3378-1 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 LTS.
    
    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-4.4.0-89-generic    4.4.0-89.112~14.04.1
      linux-image-4.4.0-89-generic-lpae  4.4.0-89.112~14.04.1
      linux-image-4.4.0-89-lowlatency  4.4.0-89.112~14.04.1
      linux-image-4.4.0-89-powerpc-e500mc  4.4.0-89.112~14.04.1
      linux-image-4.4.0-89-powerpc-smp  4.4.0-89.112~14.04.1
      linux-image-4.4.0-89-powerpc64-emb  4.4.0-89.112~14.04.1
      linux-image-4.4.0-89-powerpc64-smp  4.4.0-89.112~14.04.1
      linux-image-generic-lpae-lts-xenial  4.4.0.89.74
      linux-image-generic-lts-xenial  4.4.0.89.74
      linux-image-lowlatency-lts-xenial  4.4.0.89.74
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.89.74
      linux-image-powerpc-smp-lts-xenial  4.4.0.89.74
      linux-image-powerpc64-emb-lts-xenial  4.4.0.89.74
      linux-image-powerpc64-smp-lts-xenial  4.4.0.89.74
    
    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-3378-2
      https://www.ubuntu.com/usn/usn-3378-1
      CVE-2017-1000365, CVE-2017-10810, CVE-2017-7482, CVE-2017-7533
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-89.112~14.04.1
    
    
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