Medium 4.4Published Aug 23, 2022

CVE-2021-4037Kernel: security regression for cve-2018-13405

Updated under an hour ago (Oct 26, 2026, 1:23 PM ET)

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It affects Linux kernel and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Linux kernel

Exploited in the last 30 days

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.

CVSS: 4.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux kernel linux:kernel (from the name)	before 5.4.241; from 5.5 before 5.10.146; 5.12 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8 redhat:enterprise_linux	from 0:4.18.0-372.9.1.rt7.166.el8 not affected	CNA record
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support redhat:rhel_eus	from 0:4.18.0-305.49.1.rt7.121.el8_4 not affected	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1	CISA ADP
linux linux_kernel linux:linux_kernel	before 5.11	NVD
debian debian_linux debian:debian_linux	10.0; 11.0	NVD

References

References

https://access.redhat.com/errata/RHSA-2022:1975	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2022:1988	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2022:4829	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2022:4835	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2021-4037	vdb-entry, x-refsource-redhat, third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2027239	issue-tracking, x-refsource-redhat, third-party-advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=01ea173e103e	mailing-list, patch, vendor-advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fa3ecd87848	mailing-list, patch, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2004810	issue-tracking, permissions-required, third-party-advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html	mailing-list, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.