What is CVE-2021-47567?

CVE-2021-47567 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.9.5 onward and patched in 5.10.83, 5.15.6 and 5.16. CVE-2021-47567 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47567?

CVE-2021-47567 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-2021-47567?

Yes, CVE-2021-47567 has been patched. Fixed versions include 5.10.83, 5.15.6 and 5.16. If you are running Linux kernel 5.9.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47567 actively exploited?

CVE-2021-47567 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47567

Medium

In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead.

Package Linux Kernel

Published 2024-05-24

Last modified 2025-09-18

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 5.9.5, 5.10 and later are affected. Fixed in 5.10.83, 5.15.6, 5.16 and their respective stable series.

Affected from

≥ 5.9.5 ≥ 5.10

Fixed in

✓ 5.10.83 5.10.x ✓ 5.15.6 5.15.x ✓ 5.16

References

3 total

Kernel Git
https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e

Patch
Kernel Git
https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b

Patch
Kernel Git
https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7

Patch

Details

CVE ID CVE-2021-47567

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-24

Modified 2025-09-18

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47567?

CVE-2021-47567 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.9.5 onward and has been patched in 5.10.83, 5.15.6 and 5.16. CVE-2021-47567 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47567?

CVE-2021-47567 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-2021-47567?

Yes. CVE-2021-47567 has been patched. Fixed versions include 5.10.83, 5.15.6 and 5.16. If you are running Linux kernel 5.9.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47567 actively exploited?

No. CVE-2021-47567 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.