Ubuntu 3053-1: Linux kernel (Vivid HWE) vulnerabilities

    Date10 Aug 2016
    CategoryUbuntu
    319
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3053-1
    August 10, 2016
    
    linux-lts-vivid 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-lts-vivid: Linux hardware enablement kernel from Vivid for Trusty
    
    Details:
    
    A missing permission check when settings ACLs was discovered in nfsd. A
    local user could exploit this flaw to gain access to any file by setting an
    ACL. (CVE-2016-1237)
    
    It was discovered that the keyring implementation in the Linux kernel did
    not ensure a data structure was initialized before referencing it after an
    error condition occurred. A local attacker could use this to cause a denial
    of service (system crash). (CVE-2016-4470)
    
    Sasha Levin discovered that a use-after-free existed in the percpu
    allocator in the Linux kernel. A local attacker could use this to cause a
    denial of service (system crash) or possibly execute arbitrary code with
    administrative privileges. (CVE-2016-4794)
    
    Kangjie Lu discovered an information leak in the netlink implementation of
    the Linux kernel. A local attacker could use this to obtain sensitive
    information from kernel memory. (CVE-2016-5243)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.19.0-66-generic   3.19.0-66.74~14.04.1
      linux-image-3.19.0-66-generic-lpae  3.19.0-66.74~14.04.1
      linux-image-3.19.0-66-lowlatency  3.19.0-66.74~14.04.1
      linux-image-3.19.0-66-powerpc-e500mc  3.19.0-66.74~14.04.1
      linux-image-3.19.0-66-powerpc-smp  3.19.0-66.74~14.04.1
      linux-image-3.19.0-66-powerpc64-emb  3.19.0-66.74~14.04.1
      linux-image-3.19.0-66-powerpc64-smp  3.19.0-66.74~14.04.1
    
    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.
    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-3053-1
      CVE-2016-1237, CVE-2016-4470, CVE-2016-4794, CVE-2016-5243
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-vivid/3.19.0-66.74~14.04.1
    
    
    
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