CVE-2021-4037

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.02%
Vendor Advisory debian.org Vendor Advisory kernel.org Vendor Advisory kernel.org
Affected: n/a Kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2004810 issue tracking permissions required third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2027239 issue tracking third party advisory
https://access.redhat.com/security/cve/CVE-2021-4037 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://www.debian.org/security/2022/dsa-5257 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-4037?
CVE-2021-4037 has been scored as a high severity vulnerability.
How to fix CVE-2021-4037?
To fix CVE-2021-4037, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-4037 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-4037 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-4037?
CVE-2021-4037 affects n/a Kernel.
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