Ubuntu 0022-1: Linux kernel vulnerability

    Date16 May 2017
    CategoryUbuntu
    103
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Kernel Live Patch Security Notice LSN-0022-1
    May 16, 2017
    
    linux vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu:
    
    | Series           | Base kernel  | Arch     | flavors          |
    |------------------+--------------+----------+------------------|
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    It was discovered that a use-after-free flaw existed in the filesystem
    encryption subsystem in the Linux kernel. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2017-7374)
    
    Andreas Gruenbacher and Jan Kara discovered that the filesystem
    implementation in the Linux kernel did not clear the setgid bit during a
    setxattr call. A local attacker could use this to possibly elevate group
    privileges. (CVE-2016-7097)
    
    Update instructions:
    
    The problem can be corrected by updating your livepatches to the following
    versions:
    
    | Kernel          | Version  | flavors                  |
    |-----------------+----------+--------------------------|
    | 4.4.0-21.37     | 22.5     | generic, lowlatency      |
    | 4.4.0-22.39     | 22.4     | generic, lowlatency      |
    | 4.4.0-22.40     | 22.4     | generic, lowlatency      |
    | 4.4.0-24.43     | 22.4     | generic, lowlatency      |
    | 4.4.0-28.47     | 22.4     | generic, lowlatency      |
    | 4.4.0-31.50     | 22.4     | generic, lowlatency      |
    | 4.4.0-34.53     | 22.4     | generic, lowlatency      |
    | 4.4.0-36.55     | 22.4     | generic, lowlatency      |
    | 4.4.0-38.57     | 22.4     | generic, lowlatency      |
    | 4.4.0-42.62     | 22.4     | generic, lowlatency      |
    | 4.4.0-43.63     | 22.4     | generic, lowlatency      |
    | 4.4.0-45.66     | 22.4     | generic, lowlatency      |
    | 4.4.0-47.68     | 22.4     | generic, lowlatency      |
    | 4.4.0-51.72     | 22.4     | generic, lowlatency      |
    | 4.4.0-53.74     | 22.4     | generic, lowlatency      |
    | 4.4.0-57.78     | 22.4     | generic, lowlatency      |
    | 4.4.0-59.80     | 22.4     | generic, lowlatency      |
    | 4.4.0-62.83     | 22.4     | generic, lowlatency      |
    | 4.4.0-63.84     | 22.4     | generic, lowlatency      |
    | 4.4.0-64.85     | 22.4     | generic, lowlatency      |
    | 4.4.0-66.87     | 22.4     | generic, lowlatency      |
    | 4.4.0-67.88     | 22.4     | generic, lowlatency      |
    | 4.4.0-70.91     | 22.4     | generic, lowlatency      |
    | 4.4.0-71.92     | 22.4     | generic, lowlatency      |
    | 4.4.0-71.92     | 22.4     | generic, lowlatency      |
    | 4.4.0-72.93     | 22.4     | generic, lowlatency      |
    
    Additionally, you should install an updated kernel with these fixes and
    reboot at your convienience.
    
    References:
      CVE-2016-7097, CVE-2017-7374
    
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