Ubuntu 2589-1: Linux kernel (Utopic HWE) vulnerabilities

    Date30 Apr 2015
    CategoryUbuntu
    27
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2589-1
    April 30, 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 the Xen virtual machine subsystem of the Linux
    kernel did not properly restrict access to PCI command registers. A local
    guest user could exploit this flaw to cause a denial of service (host
    crash). (CVE-2015-2150)
    
    A stack overflow was discovered in the the microcode loader for the intel
    x86 platform. A local attacker could exploit this flaw to cause a denial of
    service (kernel crash) or to potentially execute code with kernel
    privileges. (CVE-2015-2666)
    
    A privilege escalation was discovered in the fork syscal vi the int80 entry
    on 64 bit kernels with 32 bit emulation support. An unprivileged local
    attacker could exploit this flaw to increase their privileges on the
    system. (CVE-2015-2830)
    
    It was discovered that the Linux kernel's IPv6 networking stack has a flaw
    that allows using route advertisement (RA) messages to set the 'hop_limit'
    to values that are too low. An unprivileged attacker on a local network
    could exploit this flaw to cause a denial of service (IPv6 messages
    dropped). (CVE-2015-2922)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.16.0-36-generic   3.16.0-36.48~14.04.1
      linux-image-3.16.0-36-generic-lpae  3.16.0-36.48~14.04.1
      linux-image-3.16.0-36-lowlatency  3.16.0-36.48~14.04.1
      linux-image-3.16.0-36-powerpc-e500mc  3.16.0-36.48~14.04.1
      linux-image-3.16.0-36-powerpc-smp  3.16.0-36.48~14.04.1
      linux-image-3.16.0-36-powerpc64-emb  3.16.0-36.48~14.04.1
      linux-image-3.16.0-36-powerpc64-smp  3.16.0-36.48~14.04.1
    
    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-2589-1
      CVE-2015-2150, CVE-2015-2666, CVE-2015-2830, CVE-2015-2922
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-36.48~14.04.1
    
    
    
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