UBUNTU-CVE-2018-18281

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    UBUNTU-CVE-2018-18281

    Published: 30 Oct 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-18281
    Aliases:
    USN-3832-1
    USN-3835-1
    USN-3871-1

    Summary:

    Details: Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.

    References: https://ubuntu.com/security/CVE-2018-18281, https://git.kernel.org/linus/eb66ae030829605d61fbef1909ce310e29f78821, https://bugs.chromium.org/p/project-zero/issues/detail?id=1695, https://ubuntu.com/security/notices/USN-3832-1, https://ubuntu.com/security/notices/USN-3835-1, https://ubuntu.com/security/notices/USN-3871-1, https://ubuntu.com/security/notices/USN-3871-3, https://ubuntu.com/security/notices/USN-3871-4, https://ubuntu.com/security/notices/USN-3880-1, https://ubuntu.com/security/notices/USN-3880-2, https://ubuntu.com/security/notices/USN-3871-5, https://www.cve.org/CVERecord?id=CVE-2018-18281

    Affected packages

    Package

    Name: linux

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.13.0-165.215

    Affected versions

    3.11.0-12.19

    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
    UBUNTU-CVE-2018-18281 | CVE-DB