UBUNTU-CVE-2021-4002

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-4002

    UBUNTU-CVE-2021-4002

    Published: 26 Nov 2021Last Modified: 9 Sept 2026
    Upstream:
    CVE-2021-4002
    Aliases:
    USN-5206-1
    USN-5207-1
    USN-5208-1

    Summary:

    Details: A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.

    References: https://ubuntu.com/security/CVE-2021-4002, https://www.openwall.com/lists/oss-security/2021/11/25/1, https://git.kernel.org/linus/a4a118f2eead1d6c49e00765de89878288d4b890, https://ubuntu.com/security/notices/USN-5206-1, https://ubuntu.com/security/notices/USN-5207-1, https://ubuntu.com/security/notices/USN-5208-1, https://ubuntu.com/security/notices/USN-5209-1, https://ubuntu.com/security/notices/USN-5210-1, https://ubuntu.com/security/notices/USN-5211-1, https://ubuntu.com/security/notices/USN-5218-1, https://www.cve.org/CVERecord?id=CVE-2021-4002

    Affected packages

    Package

    Name: linux

    Purl: pkg:deb/ubuntu/linux?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.13.0-189.240

    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-2021-4002 | CVE-DB