Ubuntu 3162-1: Linux kernel vulnerabilities

    Date20 Dec 2016
    CategoryUbuntu
    50
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3162-1
    December 20, 2016
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.10
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    CAI Qian discovered that shared bind mounts in a mount namespace
    exponentially added entries without restriction to the Linux kernel's mount
    table. A local attacker could use this to cause a denial of service (system
    crash). (CVE-2016-6213)
    
    It was discovered that the KVM implementation for x86/x86_64 in the Linux
    kernel could dereference a null pointer. An attacker in a guest virtual
    machine could use this to cause a denial of service (system crash) in the
    KVM host. (CVE-2016-8630)
    
    Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation
    in the Linux kernel contained a buffer overflow when handling fragmented
    packets. A remote attacker could use this to possibly execute arbitrary
    code with administrative privileges. (CVE-2016-8633)
    
    Marco Grassi discovered that the TCP implementation in the Linux kernel
    mishandles socket buffer (skb) truncation. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2016-8645)
    
    It was discovered that the keyring implementation in the Linux kernel
    improperly handled crypto registration in conjunction with successful key-
    type registration. A local attacker could use this to cause a denial of
    service (system crash). (CVE-2016-9313)
    
    Andrey Konovalov discovered that the SCTP implementation in the Linux
    kernel improperly handled validation of incoming data. A remote attacker
    could use this to cause a denial of service (system crash). (CVE-2016-9555)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.10:
      linux-image-4.8.0-32-generic    4.8.0-32.34
      linux-image-4.8.0-32-generic-lpae  4.8.0-32.34
      linux-image-4.8.0-32-lowlatency  4.8.0-32.34
      linux-image-4.8.0-32-powerpc-e500mc  4.8.0-32.34
      linux-image-4.8.0-32-powerpc-smp  4.8.0-32.34
      linux-image-4.8.0-32-powerpc64-emb  4.8.0-32.34
      linux-image-generic             4.8.0.32.41
      linux-image-generic-lpae        4.8.0.32.41
      linux-image-lowlatency          4.8.0.32.41
      linux-image-powerpc-e500mc      4.8.0.32.41
      linux-image-powerpc-smp         4.8.0.32.41
      linux-image-powerpc64-emb       4.8.0.32.41
    
    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-3162-1
      CVE-2016-6213, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645,
      CVE-2016-9313, CVE-2016-9555
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.8.0-32.34
    
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