Ubuntu 2947-1: Linux kernel vulnerabilities

    Date06 Apr 2016
    CategoryUbuntu
    42
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2947-1
    April 06, 2016
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 15.10
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    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)
    
    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)
    
    It was discovered that the extended Berkeley Packet Filter (eBPF)
    implementation in the Linux kernel did not correctly compute branch offsets
    for backward jumps after ctx expansion. A local attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2016-2383)
    
    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)
    
    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 15.10:
      linux-image-4.2.0-35-generic    4.2.0-35.40
      linux-image-4.2.0-35-generic-lpae  4.2.0-35.40
      linux-image-4.2.0-35-lowlatency  4.2.0-35.40
      linux-image-4.2.0-35-powerpc-e500mc  4.2.0-35.40
      linux-image-4.2.0-35-powerpc-smp  4.2.0-35.40
      linux-image-4.2.0-35-powerpc64-emb  4.2.0-35.40
      linux-image-4.2.0-35-powerpc64-smp  4.2.0-35.40
    
    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-2947-1
      CVE-2015-7833, CVE-2015-8812, CVE-2016-2085, CVE-2016-2383,
      CVE-2016-2550, CVE-2016-2847
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.2.0-35.40
    
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