Ubuntu 0029-1: Linux kernel vulnerability

    Date30 Aug 2017
    CategoryUbuntu
    94
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Kernel Live Patch Security Notice LSN-0029-1
    August 30, 2017
    
    linux vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu:
    
    | Series           | Base kernel  | Arch     | flavors          |
    |------------------+--------------+----------+------------------|
    | Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |
    | 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 the Linux kernel did not honor the UEFI secure boot
    mode when performing a kexec operation. A local attacker could use this to
    bypass secure boot restrictions. (CVE-2015-7837)
    
    Huang Weller discovered that the ext4 filesystem implementation in the
    Linux kernel mishandled a needs-flushing-before-commit list. A local
    attacker could use this to expose sensitive information. (CVE-2017-7495)
    
    Update instructions:
    
    The problem can be corrected by updating your livepatches to the following
    versions:
    
    | Kernel          | Version  | flavors                  |
    |-----------------+----------+--------------------------|
    | 4.4.0-21.37     | 29.1     | generic, lowlatency      |
    | 4.4.0-22.39     | 29.1     | generic, lowlatency      |
    | 4.4.0-22.40     | 29.1     | generic, lowlatency      |
    | 4.4.0-24.43     | 29.1     | generic, lowlatency      |
    | 4.4.0-28.47     | 29.1     | generic, lowlatency      |
    | 4.4.0-31.50     | 29.1     | generic, lowlatency      |
    | 4.4.0-34.53     | 29.1     | generic, lowlatency      |
    | 4.4.0-36.55     | 29.1     | generic, lowlatency      |
    | 4.4.0-38.57     | 29.1     | generic, lowlatency      |
    | 4.4.0-42.62     | 29.1     | generic, lowlatency      |
    | 4.4.0-43.63     | 29.1     | generic, lowlatency      |
    | 4.4.0-45.66     | 29.1     | generic, lowlatency      |
    | 4.4.0-47.68     | 29.1     | generic, lowlatency      |
    | 4.4.0-51.72     | 29.1     | generic, lowlatency      |
    | 4.4.0-53.74     | 29.1     | generic, lowlatency      |
    | 4.4.0-57.78     | 29.1     | generic, lowlatency      |
    | 4.4.0-59.80     | 29.1     | generic, lowlatency      |
    | 4.4.0-62.83     | 29.1     | generic, lowlatency      |
    | 4.4.0-63.84     | 29.1     | generic, lowlatency      |
    | 4.4.0-64.85     | 29.1     | generic, lowlatency      |
    | 4.4.0-66.87     | 29.1     | generic, lowlatency      |
    | 4.4.0-67.88     | 29.1     | generic, lowlatency      |
    | 4.4.0-70.91     | 29.1     | generic, lowlatency      |
    | 4.4.0-71.92     | 29.1     | generic, lowlatency      |
    | 4.4.0-72.93     | 29.1     | generic, lowlatency      |
    | 4.4.0-75.96     | 29.1     | generic, lowlatency      |
    | 4.4.0-77.98     | 29.1     | generic, lowlatency      |
    | 4.4.0-78.99     | 29.1     | generic, lowlatency      |
    | 4.4.0-79.100    | 29.1     | generic, lowlatency      |
    | 4.4.0-81.104    | 29.1     | generic, lowlatency      |
    | 4.4.0-83.106    | 29.1     | generic, lowlatency      |
    | 4.4.0-87.110    | 29.1     | generic, lowlatency      |
    | 4.4.0-89.112    | 29.1     | generic, lowlatency      |
    | 4.4.0-91.114    | 29.1     | generic, lowlatency      |
    | lts-4.4.0-21.37_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-22.39_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-24.43_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-28.47_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-31.50_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-34.53_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-36.55_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-38.57_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-42.62_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-45.66_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-47.68_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-51.72_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-53.74_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-57.78_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-59.80_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-62.83_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-63.84_14.04.2-lts-xenial | 14.04.2  | generic, lowlatency      |
    | lts-4.4.0-64.85_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-66.87_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-70.91_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-71.92_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-72.93_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-75.96_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-78.99_14.04.2-lts-xenial | 14.04.2  | generic, lowlatency      |
    | lts-4.4.0-79.100_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-81.104_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    | lts-4.4.0-87.110_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
    
    Additionally, you should install an updated kernel with these fixes and
    reboot at your convienience.
    
    References:
      CVE-2015-7837, CVE-2017-7495
    
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