Ubuntu 3169-1: Linux kernel vulnerabilities

    Date11 Jan 2017
    CategoryUbuntu
    47
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3169-1
    January 11, 2017
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    Dmitry Vyukov discovered that the KVM implementation in the Linux kernel
    did not properly initialize the Code Segment (CS) in certain error cases. A
    local attacker could use this to expose sensitive information (kernel
    memory). (CVE-2016-9756)
    
    Andrey Konovalov discovered that signed integer overflows existed in the
    setsockopt() system call when handling the SO_SNDBUFFORCE and
    SO_RCVBUFFORCE options. A local attacker with the CAP_NET_ADMIN capability
    could use this to cause a denial of service (system crash or memory
    corruption). (CVE-2016-9793)
    
    Baozeng Ding discovered a race condition that could lead to a use-after-
    free in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux
    kernel. A local attacker could use this to cause a denial of service
    (system crash). (CVE-2016-9794)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-59-generic    4.4.0-59.80
      linux-image-4.4.0-59-generic-lpae  4.4.0-59.80
      linux-image-4.4.0-59-lowlatency  4.4.0-59.80
      linux-image-4.4.0-59-powerpc-e500mc  4.4.0-59.80
      linux-image-4.4.0-59-powerpc-smp  4.4.0-59.80
      linux-image-4.4.0-59-powerpc64-emb  4.4.0-59.80
      linux-image-4.4.0-59-powerpc64-smp  4.4.0-59.80
      linux-image-generic             4.4.0.59.62
      linux-image-generic-lpae        4.4.0.59.62
      linux-image-lowlatency          4.4.0.59.62
      linux-image-powerpc-e500mc      4.4.0.59.62
      linux-image-powerpc-smp         4.4.0.59.62
      linux-image-powerpc64-emb       4.4.0.59.62
      linux-image-powerpc64-smp       4.4.0.59.62
    
    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-3169-1
      CVE-2016-9756, CVE-2016-9793, CVE-2016-9794
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-59.80
    
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