Ubuntu 2849-1: Linux kernel (Utopic HWE) vulnerabilities

    Date19 Dec 2015
    CategoryUbuntu
    54
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2849-1
    December 19, 2015
    
    linux-lts-utopic vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-lts-utopic: Linux hardware enablement kernel from Utopic
    
    Details:
    
    Felix Wilhelm discovered a race condition in the Xen paravirtualized
    drivers which can cause double fetch vulnerabilities. An attacker in the
    paravirtualized guest could exploit this flaw to cause a denial of service
    (crash the host) or potentially execute arbitrary code on the host.
    (CVE-2015-8550)
    
    Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
    perform sanity checks on the device's state. An attacker could exploit this
    flaw to cause a denial of service (NULL dereference) on the host.
    (CVE-2015-8551)
    
    Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
    perform sanity checks on the device's state. An attacker could exploit this
    flaw to cause a denial of service by flooding the logging system with
    WARN() messages causing the initial domain to exhaust disk space.
    (CVE-2015-8552)
    
    Jann Horn discovered a ptrace issue with user namespaces in the Linux
    kernel. The namespace owner could potentially exploit this flaw by ptracing
    a root owned process entering the user namespace to elevate its privileges
    and potentially gain access outside of the namespace.
    (http://bugs.launchpad.net/bugs/1527374)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.16.0-57-generic   3.16.0-57.77~14.04.1
      linux-image-3.16.0-57-generic-lpae  3.16.0-57.77~14.04.1
      linux-image-3.16.0-57-lowlatency  3.16.0-57.77~14.04.1
      linux-image-3.16.0-57-powerpc-e500mc  3.16.0-57.77~14.04.1
      linux-image-3.16.0-57-powerpc-smp  3.16.0-57.77~14.04.1
      linux-image-3.16.0-57-powerpc64-emb  3.16.0-57.77~14.04.1
      linux-image-3.16.0-57-powerpc64-smp  3.16.0-57.77~14.04.1
    
    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:
      http://www.ubuntu.com/usn/usn-2849-1
      CVE-2015-8550, CVE-2015-8551, CVE-2015-8552, http://bugs.launchpad.net/bugs/1527374
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-57.77~14.04.1
    
    
    
    You are not authorised to post comments.

    Comments powered by CComment

    LinuxSecurity Poll

    What do you think of the articles on LinuxSecurity?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 3 answer(s).
    /main-polls/24-what-do-you-think-of-the-quality-of-the-articles-on-linuxsecurity?task=poll.vote&format=json
    24
    radio
    [{"id":"87","title":"Excellent, don't change a thing!","votes":"23","type":"x","order":"1","pct":56.1,"resources":[]},{"id":"88","title":"Should be more technical","votes":"5","type":"x","order":"2","pct":12.2,"resources":[]},{"id":"89","title":"Should include more HOWTOs","votes":"13","type":"x","order":"3","pct":31.71,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
    bottom200

    Advisories

    We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.