Ubuntu 2466-1: Linux kernel vulnerabilities

    Date13 Jan 2015
    CategoryUbuntu
    41
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2466-1
    January 13, 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:
    
    A null pointer dereference flaw was discovered in the the Linux kernel's
    SCTP implementation when ASCONF is used. A remote attacker could exploit
    this flaw to cause a denial of service (system crash) via a malformed INIT
    chunk. (CVE-2014-7841)
    
    A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual
    Machine) subsystem of the Linux kernel was discovered. A guest OS user
    could exploit this flaw to cause a denial of service (guest OS crash) via a
    specially crafted application. (CVE-2014-7842)
    
    Miloš Prchlík reported a flaw in how the ARM64 platform handles a single
    byte overflow in __clear_user. A local user could exploit this flaw to
    cause a denial of service (system crash) by reading one byte beyond a
    /dev/zero page boundary. (CVE-2014-7843)
    
    A stack buffer overflow was discovered in the ioctl command handling for
    the Technotrend/Hauppauge USB DEC devices driver. A local user could
    exploit this flaw to cause a denial of service (system crash) or possibly
    gain privileges. (CVE-2014-8884)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-44-generic   3.13.0-44.73
      linux-image-3.13.0-44-generic-lpae  3.13.0-44.73
      linux-image-3.13.0-44-lowlatency  3.13.0-44.73
      linux-image-3.13.0-44-powerpc-e500  3.13.0-44.73
      linux-image-3.13.0-44-powerpc-e500mc  3.13.0-44.73
      linux-image-3.13.0-44-powerpc-smp  3.13.0-44.73
      linux-image-3.13.0-44-powerpc64-emb  3.13.0-44.73
      linux-image-3.13.0-44-powerpc64-smp  3.13.0-44.73
    
    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-2466-1
      CVE-2014-7841, CVE-2014-7842, CVE-2014-7843, CVE-2014-8884
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-44.73
    
    
    
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