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    CVE-2021-4037

    A vulnerability was found in the fs/inode.c:inode_init_owner() function logic of the LInux kernel that allows local users to create files for the XFS file-system with an unintended group ownership and with group execution and SGID permission bits set, in a scenario where a directory is SGID and belongs to a certain group and is writable by a user who is not a member of this group. This can lead to excessive permissions granted in case when they should not. This vulnerability is similar to the previous CVE-2018-13405 and adds the missed fix for the XFS.

    Published:Sep 16, 2021
    Last Modified:Aug 10, 2026
    EPS:Aug 24, 2022
    EPSS Score:0.00283
    CVSS Score:4.4

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-284 Improper Access Control

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    References

    https://access.redhat.com/errata/RHSA-2022:1975
    https://access.redhat.com/errata/RHSA-2022:1988
    https://access.redhat.com/errata/RHSA-2022:4829
    https://access.redhat.com/errata/RHSA-2022:4835
    https://access.redhat.com/security/cve/CVE-2021-4037
    https://bugzilla.redhat.com/show_bug.cgi?id=2027239
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01ea173e103e
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848
    https://access.redhat.com/security/cve/CVE-2021-4037
    https://bugzilla.redhat.com/show_bug.cgi?id=2004810
    https://bugzilla.redhat.com/show_bug.cgi?id=2027239
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01ea173e103e
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848
    https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html
    https://www.debian.org/security/2022/dsa-5257

    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