Ubuntu 2779-1: Linux kernel vulnerabilities

    Date20 Oct 2015
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-2779-1
    October 20, 2015
    linux vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 15.04
    Several security issues were fixed in the kernel.
    Software Description:
    - linux: Linux kernel
    It was discovered that the Linux kernel did not check if a new IPv6 MTU set
    by a user space application was valid. A remote attacker could forge a
    route advertisement with an invalid MTU that a user space daemon like
    NetworkManager would honor and apply to the kernel, causing a denial of
    service. (CVE-2015-0272)
    It was discovered that virtio networking in the Linux kernel did not handle
    fragments correctly, leading to kernel memory corruption. A remote attacker
    could use this to cause a denial of service (system crash) or possibly
    execute code with administrative privileges. (CVE-2015-5156)
    It was discovered that the Reliable Datagram Sockets (RDS) implementation
    in the Linux kernel did not verify sockets were properly bound before
    attempting to send a message, which could cause a NULL pointer dereference.
    An attacker could use this to cause a denial of service (system crash).
    Ben Hutchings discovered that the Advanced Union Filesystem (aufs) for the
    Linux kernel did not correctly handle references of memory mapped files
    from an aufs mount. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code with
    administrative privileges. (CVE-2015-7312)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 15.04:
      linux-image-3.19.0-31-generic   3.19.0-31.36
      linux-image-3.19.0-31-generic-lpae  3.19.0-31.36
      linux-image-3.19.0-31-lowlatency  3.19.0-31.36
      linux-image-3.19.0-31-powerpc-e500mc  3.19.0-31.36
      linux-image-3.19.0-31-powerpc-smp  3.19.0-31.36
      linux-image-3.19.0-31-powerpc64-emb  3.19.0-31.36
      linux-image-3.19.0-31-powerpc64-smp  3.19.0-31.36
    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. If
    you use linux-restricted-modules, you have to update that package as
    well to get modules which work with the new kernel version. Unless you
    manually uninstalled the standard kernel metapackages (e.g. linux-generic,
    linux-server, linux-powerpc), a standard system upgrade will automatically
    perform this as well.
      CVE-2015-0272, CVE-2015-5156, CVE-2015-6937, CVE-2015-7312
    Package Information:
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