Ubuntu 2847-1: Linux kernel (Trusty HWE) vulnerabilities

    Date 19 Dec 2015
    103
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2847-1
    December 19, 2015
    
    linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty
    
    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.
    (https://bugs.launchpad.net/bugs/1527374)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.13.0-74-generic   3.13.0-74.118~precise1
      linux-image-3.13.0-74-generic-lpae  3.13.0-74.118~precise1
    
    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-2847-1
      CVE-2015-8550, CVE-2015-8551, CVE-2015-8552, https://bugs.launchpad.net/bugs/1527374
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-74.118~precise1
    
    
    

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    If you are using full-disk encryption: are you concerned about the resulting performance hit?

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    /main-polls/34-if-you-are-using-full-disk-encryption-are-you-concerned-about-the-resulting-performance-hit?task=poll.vote&format=json
    34
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    [{"id":"120","title":"Yes","votes":"10","type":"x","order":"1","pct":71.43,"resources":[]},{"id":"121","title":"No ","votes":"4","type":"x","order":"2","pct":28.57,"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
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