CVE-2021-4037 — CVE & Security Advisory Radar

🎯 CVE-2021-4037 🇪🇺 EUVD

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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. Th

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.

Klassifikation & Betroffenheit:

Red HatLinux Kernel 5.5 <5.10.146Kernel * <5.4.241Red Hat Enterprise Linux 8.4 Extended Update Support patch: 0:4.18.0-305.49.1.rt7.121.el8_4Red Hat Enterprise Linux 8 patch: 0:4.18.0-372.9.1.rt7.166.el8Red Hat Enterprise Linux 8.4 Extended Update Support patch: 0:4.18.0-305.49.1.el8_4Red Hat Enterprise Linux 8 patch: 0:4.18.0-372.9.1.el8

Improper Control of Generation of Code ('Code Injection') 🎯 Medium

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

🛡️ Empfohlene Mitigation: Refactor your program so that you do not have to dynamically generate code.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-35 · Leverage Executable Code in Non-Executab… (Very High) CAPEC-77 · Manipulating User-Controlled Variables (Very High) CAPEC-242 · Code Injection (High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.006 · Obfuscated Files or Information: H… T1027.009 · Obfuscated Files or Information: E… T1564.009 · Hide Artifacts: Resource Forking

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-79652 5.9 CVE-2026-59847 5.9 CVE-2026-58015 5.9 CVE-2026-11788 5.9 CVE-2026-9793 5.9

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2021

Veröffentlicht 08/2022

Heute 22.09.

CVSS-Vektor-Analyse: 4.4

AV · Angriffsvektor Lokal

AC · Komplexität Gering

PR · Privilegien Gering

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Gering

I · Integrität Gering

A · Verfügbarkeit Keine

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

Veröffentlicht:24.08.2022

Aktualisiert:10.08.2026 16:47

Assigner (CNA):redhat

EUVD-ID:EUVD-2021-33937

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	2026-09-04	2026-09-21
≥90 %	0	488
≥50 %	0	1471
≥10 %	0	7
<10 %	300	0

EPSS

0.3%

CVE-2021-4037 💻 Lokal 🔑 Geringe Nutzerrechte nötig

Red Hat

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. Th

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

24.08.2022

🛡️ Details ➔

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