Ubuntu 3168-1: Linux kernel vulnerabilities

    Date11 Jan 2017
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-3168-1
    January 11, 2017
    linux vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 14.04 LTS
    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)
    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)
    Baozeng Ding discovered a double free in the netlink_dump() function in the
    Linux kernel. A local attacker could use this to cause a denial of service
    (system crash). (CVE-2016-9806)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-107-generic  3.13.0-107.154
      linux-image-3.13.0-107-generic-lpae  3.13.0-107.154
      linux-image-3.13.0-107-lowlatency  3.13.0-107.154
      linux-image-3.13.0-107-powerpc-e500  3.13.0-107.154
      linux-image-3.13.0-107-powerpc-e500mc  3.13.0-107.154
      linux-image-3.13.0-107-powerpc-smp  3.13.0-107.154
      linux-image-3.13.0-107-powerpc64-emb  3.13.0-107.154
      linux-image-3.13.0-107-powerpc64-smp  3.13.0-107.154
    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, CVE-2016-9794, CVE-2016-9806
    Package Information:

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