USN-3170-1: Linux kernel vulnerabilities

Discussion in 'Security' started by Ubuntu Security Notices, Jan 11, 2017.

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  1. Ubuntu Security Notice USN-3170-1

    11th January, 2017

    linux vulnerabilities

    A security issue affects these releases of Ubuntu and its derivatives:

    • Ubuntu 16.10

    Several security issues were fixed in the kernel.

    Software description

    • linux - Linux kernel

    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)

    Update instructions

    The problem can be corrected by updating your system to the following package version:

    Ubuntu 16.10:
    linux-image-4.8.0-34-lowlatency 4.8.0-34.36
    linux-image-4.8.0-34-generic-lpae 4.8.0-34.36
    linux-image-4.8.0-34-powerpc64-emb 4.8.0-34.36
    linux-image-4.8.0-34-generic 4.8.0-34.36
    linux-image-4.8.0-34-powerpc-e500mc 4.8.0-34.36
    linux-image-4.8.0-34-powerpc-smp 4.8.0-34.36

    To update your system, please follow these instructions:

    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.


    CVE-2016-9756, CVE-2016-9793

    Continue reading...
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