🛡️ CVE-2021-4037 on Debian — linux

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

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.

Distribution advisory

This page covers CVE-2021-4037 as tracked by Debian, for the package linux. The fix is available in version 5.14.6-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Affected software

DEBIAN-CVE-2021-4037 is recorded against 1 package.

linux (fixed in 5.14.6-1)

Timeline and source

Published on 24 August 2022 and last revised on 11 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2021-4037 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2022-08-24

Updated 2026-08-20

Modified 2026-08-11

Fix URL N/A

Affected Packages

Software	From version	Fixed in
linux	—	5.14.6-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2021-4037

🔗 NVD 🔗 Mitre

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