CVE-2021-47579

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

19/06/2024

Last modified:

29/09/2025

Description

In the Linux kernel, the following vulnerability has been resolved: ovl: fix warning in ovl_create_real() Syzbot triggered the following warning in ovl_workdir_create() -> ovl_create_real(): if (!err && WARN_ON(!newdentry->d_inode)) { The reason is that the cgroup2 filesystem returns from mkdir without instantiating the new dentry. Weird filesystems such as this will be rejected by overlayfs at a later stage during setup, but to prevent such a warning, call ovl_mkdir_real() directly from ovl_workdir_create() and reject this case early.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

5.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::		4.19.222 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.168 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.88 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.11 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-47579

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools