Ubuntu 2948-1: Linux kernel (Utopic HWE) vulnerabilities

    Date06 Apr 2016
    CategoryUbuntu
    63
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2948-1
    April 06, 2016
    
    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 for Trusty
    
    Details:
    
    Ralf Spenneberg discovered that the USB driver for Clie devices in the
    Linux kernel did not properly sanity check the endpoints reported by the
    device. An attacker with physical access could cause a denial of service
    (system crash). (CVE-2015-7566)
    
    Ralf Spenneberg discovered that the usbvision driver in the Linux kernel
    did not properly sanity check the interfaces and endpoints reported by the
    device. An attacker with physical access could cause a denial of service
    (system crash). (CVE-2015-7833)
    
    Venkatesh Pottem discovered a use-after-free vulnerability in the Linux
    kernel's CXGB3 driver. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2015-8812)
    
    It was discovered that a race condition existed in the ioctl handler for
    the TTY driver in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash) or expose sensitive information.
    (CVE-2016-0723)
    
    Xiaofei Rex Guo discovered a timing side channel vulnerability in the Linux
    Extended Verification Module (EVM). An attacker could use this to affect
    system integrity. (CVE-2016-2085)
    
    David Herrmann discovered that the Linux kernel incorrectly accounted file
    descriptors to the original opener for in-flight file descriptors sent over
    a unix domain socket. A local attacker could use this to cause a denial of
    service (resource exhaustion). (CVE-2016-2550)
    
    Ralf Spenneberg discovered that the USB driver for Treo devices in the
    Linux kernel did not properly sanity check the endpoints reported by the
    device. An attacker with physical access could cause a denial of service
    (system crash). (CVE-2016-2782)
    
    It was discovered that the Linux kernel did not enforce limits on the
    amount of data allocated to buffer pipes. A local attacker could use this
    to cause a denial of service (resource exhaustion). (CVE-2016-2847)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.16.0-69-generic   3.16.0-69.89~14.04.1
      linux-image-3.16.0-69-generic-lpae  3.16.0-69.89~14.04.1
      linux-image-3.16.0-69-lowlatency  3.16.0-69.89~14.04.1
      linux-image-3.16.0-69-powerpc-e500mc  3.16.0-69.89~14.04.1
      linux-image-3.16.0-69-powerpc-smp  3.16.0-69.89~14.04.1
      linux-image-3.16.0-69-powerpc64-emb  3.16.0-69.89~14.04.1
      linux-image-3.16.0-69-powerpc64-smp  3.16.0-69.89~14.04.1
    
    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.
    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:
      http://www.ubuntu.com/usn/usn-2948-1
      CVE-2015-7566, CVE-2015-7833, CVE-2015-8812, CVE-2016-0723,
      CVE-2016-2085, CVE-2016-2550, CVE-2016-2782, CVE-2016-2847
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-69.89~14.04.1
    
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