CVE-2021-4037
Kernel: security regression for cve-2018-13405
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.
INFO
Published Date :
Aug. 24, 2022, 4:15 p.m.
Last Modified :
Aug. 10, 2026, 5:17 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2021-4037
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the affected Linux kernel packages.
- Update other affected system packages as needed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-4037.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-4037 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-4037
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-4037 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-4037 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Aug. 10, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'n/a', 'product': 'Kernel', 'versions': [{'status': 'affected', 'version': 'Fixed in Linux-kernel v5.11-rc1'}]}] [{'vendor': 'Linux', 'product': 'kernel', 'versions': [{'status': 'affected', 'version': '*', 'lessThan': '5.4.241', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.5', 'lessThan': '5.10.146', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.12', 'versionType': 'semver'}], 'packageName': 'kernel', 'collectionURL': 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::nfv', 'cpe:/a:redhat:enterprise_linux:8::realtime'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'versions': [{'status': 'unaffected', 'version': '0:4.18.0-372.9.1.rt7.166.el8', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'kernel-rt', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::crb', 'cpe:/o:redhat:enterprise_linux:8::baseos'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'versions': [{'status': 'unaffected', 'version': '0:4.18.0-372.9.1.el8', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'kernel', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:8.4::nfv', 'cpe:/a:redhat:rhel_eus:8.4::realtime'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8.4 Extended Update Support', 'versions': [{'status': 'unaffected', 'version': '0:4.18.0-305.49.1.rt7.121.el8_4', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'kernel-rt', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:8.4::crb', 'cpe:/o:redhat:rhel_eus:8.4::baseos'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8.4 Extended Update Support', 'versions': [{'status': 'unaffected', 'version': '0:4.18.0-305.49.1.el8_4', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'kernel', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 6', 'packageName': 'kernel', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 7', 'packageName': 'kernel', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 7', 'packageName': 'kernel-rt', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 9', 'packageName': 'kernel', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unaffected'}] Changed 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. 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Added Reference https://access.redhat.com/errata/RHSA-2022:1975 Added Reference https://access.redhat.com/errata/RHSA-2022:1988 Added Reference https://access.redhat.com/errata/RHSA-2022:4829 Added Reference https://access.redhat.com/errata/RHSA-2022:4835 Removed Reference https://bugzilla.redhat.com/show_bug.cgi?id=2004810 Removed Reference https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html Removed Reference https://www.debian.org/security/2022/dsa-5257 Removed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=2004810 Types: Issue Tracking, Permissions Required, Third Party Advisory Removed Reference Type https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html Types: Mailing List, Third Party Advisory Removed Reference Type https://www.debian.org/security/2022/dsa-5257 Types: Third Party Advisory -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'n/a', 'product': 'Kernel', 'versions': [{'status': 'affected', 'version': 'Fixed in Linux-kernel v5.11-rc1'}]}] -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://access.redhat.com/security/cve/CVE-2021-4037 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2004810 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2027239 Added Reference https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01ea173e103e Added Reference https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848 Added Reference https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html Added Reference https://www.debian.org/security/2022/dsa-5257 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Dec. 08, 2022
Action Type Old Value New Value Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html Mailing List, Third Party Advisory Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Nov. 01, 2022
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html [No Types Assigned] -
Modified Analysis by [email protected]
Oct. 28, 2022
Action Type Old Value New Value Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=2004810 Permissions Required, Third Party Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2004810 Issue Tracking, Permissions Required, Third Party Advisory Changed Reference Type https://www.debian.org/security/2022/dsa-5257 No Types Assigned https://www.debian.org/security/2022/dsa-5257 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 19, 2022
Action Type Old Value New Value Added Reference https://www.debian.org/security/2022/dsa-5257 [No Types Assigned] -
Initial Analysis by [email protected]
Aug. 29, 2022
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://access.redhat.com/security/cve/CVE-2021-4037 No Types Assigned https://access.redhat.com/security/cve/CVE-2021-4037 Third Party Advisory Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=2004810 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=2004810 Permissions Required, Third Party Advisory Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=2027239 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=2027239 Issue Tracking, Third Party Advisory Changed Reference Type https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01ea173e103e No Types Assigned https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01ea173e103e Mailing List, Patch, Vendor Advisory Changed Reference Type https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848 No Types Assigned https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848 Mailing List, Patch, Vendor Advisory Added CWE NIST NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.11