CVE-2021-4037: Debian Linux

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 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.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• Linux Linux Kernel: before 5.11 (fixed in 5.11)

Published 2022-08-24. Last modified 2026-08-10.