CVE-2021-4002

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    CVE-2021-4002

    Published: 3 Mar 2022Last Modified: 16 Apr 2026

    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://lists.debian.org/debian-lts-announce/2022/03/msg00011.html, https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html, https://www.debian.org/security/2022/dsa-5096, https://bugzilla.redhat.com/show_bug.cgi?id=2025726, https://www.oracle.com/security-alerts/cpujul2022.html, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890, https://www.openwall.com/lists/oss-security/2021/11/25/1

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2021-4002 | CVE-DB