Ubuntu 2637-1: Linux kernel vulnerabilities

    Date10 Jun 2015
    CategoryUbuntu
    67
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2637-1
    June 10, 2015
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.10
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    Xiong Zhou discovered a bug in the way the EXT4 filesystem handles
    fallocate zero range functionality when the page size is greater than the
    block size. A local attacker could exploit this flaw to cause a denial of
    service (system crash). (CVE-2015-0275)
    
    Wen Xu discovered a use-after-free flaw in the Linux kernel's ipv4 ping
    support. A local user could exploit this flaw to cause a denial of service
    (system crash) or gain administrative privileges on the system.
    (CVE-2015-3636)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.10:
      linux-image-3.16.0-39-generic   3.16.0-39.53
      linux-image-3.16.0-39-generic-lpae  3.16.0-39.53
      linux-image-3.16.0-39-lowlatency  3.16.0-39.53
      linux-image-3.16.0-39-powerpc-e500mc  3.16.0-39.53
      linux-image-3.16.0-39-powerpc-smp  3.16.0-39.53
      linux-image-3.16.0-39-powerpc64-emb  3.16.0-39.53
      linux-image-3.16.0-39-powerpc64-smp  3.16.0-39.53
    
    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-2637-1
      CVE-2015-0275, CVE-2015-3636
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.16.0-39.53
    
    
    
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