Ubuntu 2848-1: Linux kernel vulnerabilities

    Date 19 Dec 2015
    90
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2848-1
    December 19, 2015
    
    linux 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: Linux kernel
    
    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 14.04 LTS:
      linux-image-3.13.0-74-generic   3.13.0-74.118
      linux-image-3.13.0-74-generic-lpae  3.13.0-74.118
      linux-image-3.13.0-74-lowlatency  3.13.0-74.118
      linux-image-3.13.0-74-powerpc-e500  3.13.0-74.118
      linux-image-3.13.0-74-powerpc-e500mc  3.13.0-74.118
      linux-image-3.13.0-74-powerpc-smp  3.13.0-74.118
      linux-image-3.13.0-74-powerpc64-emb  3.13.0-74.118
      linux-image-3.13.0-74-powerpc64-smp  3.13.0-74.118
    
    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-2848-1
      CVE-2015-8550, CVE-2015-8551, CVE-2015-8552, https://bugs.launchpad.net/bugs/1527374
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-74.118
    
    
    

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