Ubuntu 2700-1: Linux kernel vulnerabilities

    Date30 Jul 2015
    CategoryUbuntu
    34
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2700-1
    July 31, 2015
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    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)
    
    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-3.13.0-61-generic   3.13.0-61.100
      linux-image-3.13.0-61-generic-lpae  3.13.0-61.100
      linux-image-3.13.0-61-lowlatency  3.13.0-61.100
      linux-image-3.13.0-61-powerpc-e500  3.13.0-61.100
      linux-image-3.13.0-61-powerpc-e500mc  3.13.0-61.100
      linux-image-3.13.0-61-powerpc-smp  3.13.0-61.100
      linux-image-3.13.0-61-powerpc64-emb  3.13.0-61.100
      linux-image-3.13.0-61-powerpc64-smp  3.13.0-61.100
    
    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.
    
    References:
      http://www.ubuntu.com/usn/usn-2700-1
      CVE-2015-3290, CVE-2015-3291, CVE-2015-5157
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-61.100
    
    
    
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