UBUNTU-CVE-2018-18397

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    UBUNTU-CVE-2018-18397

    Published: 12 Dec 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-18397
    Aliases:
    USN-3901-1
    USN-3901-2
    USN-3903-1

    Summary:

    Details: The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

    References: https://ubuntu.com/security/CVE-2018-18397, https://lore.kernel.org/lkml/[email protected]/, https://ubuntu.com/security/notices/USN-3901-1, https://ubuntu.com/security/notices/USN-3901-2, https://ubuntu.com/security/notices/USN-3903-1, https://ubuntu.com/security/notices/USN-3903-2, https://www.cve.org/CVERecord?id=CVE-2018-18397

    Affected packages

    Package

    Name: linux-azure

    Purl: pkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.15.0-1040.44~14.04.1

    Affected versions

    4.15.0-1023.24~14.04.1
    4.15.0-1030.31~14.04.1
    4.15.0-1031.32~14.04.1
    4.15.0-1032.33~14.04.2
    4.15.0-1035.36~14.04.2
    4.15.0-1036.38~14.04.2
    4.15.0-1037.39~14.04.2
    4.15.0-1039.41~14.04.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High