UBUNTU-CVE-2021-3981

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    UBUNTU-CVE-2021-3981

    Published: 10 Mar 2022Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-3981
    Aliases:
    USN-6355-1

    Summary:

    Details: A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.

    References: https://ubuntu.com/security/CVE-2021-3981, https://access.redhat.com/security/cve/CVE-2021-3981, https://ubuntu.com/security/notices/USN-6355-1, https://www.cve.org/CVERecord?id=CVE-2021-3981

    Affected packages

    Package

    Name: grub2-signed

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.22

    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-2021-3981 | CVE-DB