What is CVE-2021-47579?

CVE-2021-47579 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 3.18 onward and patched in 4.19.222, 5.4.168, 5.10.88 and others. CVE-2021-47579 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47579?

CVE-2021-47579 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47579?

Yes, CVE-2021-47579 has been patched. Fixed versions include 4.19.222, 5.4.168, 5.10.88 and others. If you are running Linux kernel 3.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47579 actively exploited?

CVE-2021-47579 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47579

Medium

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.

Package Linux Kernel

Published 2024-06-19

Last modified 2025-09-29

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 3.18 and later are affected. Fixed in 4.19.222, 5.4.168, 5.10.88, 5.15.11, 5.16 and their respective stable series.

Affected from

≥ 3.18

Fixed in

✓ 4.19.222 4.19.x ✓ 5.4.168 5.4.x ✓ 5.10.88 5.10.x ✓ 5.15.11 5.15.x ✓ 5.16

References

5 total

Kernel Git
https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c

Patch
Kernel Git
https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8

Patch
Kernel Git
https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7

Patch
Kernel Git
https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02

Patch
Kernel Git
https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0

Patch

Details

CVE ID CVE-2021-47579

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-06-19

Modified 2025-09-29

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47579?

CVE-2021-47579 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 3.18 onward and has been patched in 4.19.222, 5.4.168, 5.10.88 and others. CVE-2021-47579 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47579?

CVE-2021-47579 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47579?

Yes. CVE-2021-47579 has been patched. Fixed versions include 4.19.222, 5.4.168, 5.10.88 and others. If you are running Linux kernel 3.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47579 actively exploited?

No. CVE-2021-47579 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.