What is CVE-2021-47211?

CVE-2021-47211 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 3.10 onward and patched in 5.10.259, 5.15.5 and 5.16. CVE-2021-47211 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47211?

CVE-2021-47211 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-2021-47211?

Yes, CVE-2021-47211 has been patched. Fixed versions include 5.10.259, 5.15.5 and 5.16. If you are running Linux kernel 3.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47211 actively exploited?

CVE-2021-47211 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2021-47211

Medium

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix null pointer dereference on pointer cs_desc The pointer cs_desc return from snd_usb_find_clock_source could be null, so there is a potential null pointer dereference issue. Fix this by adding a null check before dereference.

Package Linux Kernel

Published 2024-04-10

Last modified 2026-06-19

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

Weakness type

CWE-476

CVE-2021-47211 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.10 and later are affected. Fixed in 5.10.259, 5.15.5, 5.16 and their respective stable series.

Affected from

≥ 3.10

Fixed in

✓ 5.10.259 5.10.x ✓ 5.15.5 5.15.x ✓ 5.16

References

3 total

Kernel Git
https://git.kernel.org/stable/c/58fa50de595f152900594c28ec9915c169643739

Patch
Kernel Git
https://git.kernel.org/stable/c/b97053df0f04747c3c1e021ecbe99db675342954

Patch
Kernel Git
https://git.kernel.org/stable/c/3455984b16eeb6914caf8b59498ef24fcc1f0a78

Details

CVE ID CVE-2021-47211

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-04-10

Modified 2026-06-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47211?

CVE-2021-47211 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 3.10 onward and has been patched in 5.10.259, 5.15.5 and 5.16. CVE-2021-47211 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47211?

CVE-2021-47211 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-2021-47211?

Yes. CVE-2021-47211 has been patched. Fixed versions include 5.10.259, 5.15.5 and 5.16. If you are running Linux kernel 3.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47211 actively exploited?

No. CVE-2021-47211 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.