Ubuntu 2689-1: Linux kernel (Utopic HWE) vulnerabilities

    Date28 Jul 2015
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-2689-1
    July 28, 2015
    linux-lts-utopic 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-lts-utopic: Linux hardware enablement kernel from Utopic
    Andy Lutomirski discovered a flaw in the Linux kernel's handling of nested
    NMIs (non-maskable interrupts). An unprivileged local user could exploit
    this flaw to cause a denial of service (system crash) or potentially
    escalate their privileges. (CVE-2015-3290)
    Colin King discovered a flaw in the add_key function of the Linux kernel's
    keyring subsystem. A local user could exploit this flaw to cause a denial
    of service (memory exhaustion). (CVE-2015-1333)
    Andy Lutomirski discovered a flaw that allows user to cause the Linux
    kernel to ignore some NMIs (non-maskable interrupts). A local unprivileged
    user could exploit this flaw to potentially cause the system to miss
    important NMIs resulting in unspecified effects. (CVE-2015-3291)
    Andy Lutomirski and Petr Matousek discovered that an NMI (non-maskable
    interrupt) that interrupts userspace and encounters an IRET fault is
    incorrectly handled by the Linux kernel. An unprivileged local user could
    exploit this flaw to cause a denial of service (kernel OOPs), corruption,
    or potentially escalate privileges on the system. (CVE-2015-5157)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 LTS:
      linux-image-3.16.0-45-generic   3.16.0-45.60~14.04.1
      linux-image-3.16.0-45-generic-lpae  3.16.0-45.60~14.04.1
      linux-image-3.16.0-45-lowlatency  3.16.0-45.60~14.04.1
      linux-image-3.16.0-45-powerpc-e500mc  3.16.0-45.60~14.04.1
      linux-image-3.16.0-45-powerpc-smp  3.16.0-45.60~14.04.1
      linux-image-3.16.0-45-powerpc64-emb  3.16.0-45.60~14.04.1
      linux-image-3.16.0-45-powerpc64-smp  3.16.0-45.60~14.04.1
    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-2015-1333, CVE-2015-3290, CVE-2015-3291, CVE-2015-5157
    Package Information:
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