Ubuntu 2844-1: Linux kernel (Utopic HWE) vulnerabilities

    Date17 Dec 2015
    CategoryUbuntu
    44
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2844-1
    December 17, 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:
    
    Jan Beulich discovered that the KVM svm hypervisor implementation in the
    Linux kernel did not properly catch Debug exceptions on AMD processors. An
    attacker in a guest virtual machine could use this to cause a denial of
    service (system crash) in the host OS. (CVE-2015-8104)
    
    郭永刚 discovered that the ppp implementation in the Linux kernel did
    not ensure that certain slot numbers are valid. A local attacker with the
    privilege to call ioctl() on /dev/ppp could cause a denial of service
    (system crash). (CVE-2015-7799)
    
    It was discovered that the driver for Digi Neo and ClassicBoard devices did
    not properly initialize data structures. A local attacker could use this to
    obtain sensitive information from the kernel. (CVE-2015-7885)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.16.0-56-generic   3.16.0-56.75~14.04.1
      linux-image-3.16.0-56-generic-lpae  3.16.0-56.75~14.04.1
      linux-image-3.16.0-56-lowlatency  3.16.0-56.75~14.04.1
      linux-image-3.16.0-56-powerpc-e500mc  3.16.0-56.75~14.04.1
      linux-image-3.16.0-56-powerpc-smp  3.16.0-56.75~14.04.1
      linux-image-3.16.0-56-powerpc64-emb  3.16.0-56.75~14.04.1
      linux-image-3.16.0-56-powerpc64-smp  3.16.0-56.75~14.04.1
    
    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. If
    you use linux-restricted-modules, you have to update that package as
    well to get modules which work with the new kernel version. Unless you
    manually uninstalled the standard kernel metapackages (e.g. linux-generic,
    linux-server, linux-powerpc), a standard system upgrade will automatically
    perform this as well.
    
    References:
      http://www.ubuntu.com/usn/usn-2844-1
      CVE-2015-7799, CVE-2015-7885, CVE-2015-8104
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-56.75~14.04.1
    
    
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