What is CVE-2021-47257?

CVE-2021-47257 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 4.4 onward and patched in 4.9.274, 4.14.238, 4.19.196 and others. CVE-2021-47257 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47257?

CVE-2021-47257 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-2021-47257?

Yes, CVE-2021-47257 has been patched. Fixed versions include 4.9.274, 4.14.238, 4.19.196 and others. If you are running Linux kernel 4.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47257 actively exploited?

CVE-2021-47257 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-2021-47257

Medium

In the Linux kernel, the following vulnerability has been resolved: net: ieee802154: fix null deref in parse dev addr Fix a logic error that could result in a null deref if the user sets the mode incorrectly for the given addr type.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-04-04

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-2021-47257 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 4.4 and later are affected. Fixed in 4.9.274, 4.14.238, 4.19.196, 5.4.127, 5.10.45, 5.12.12, 5.13 and their respective stable series.

Affected from

≥ 4.4

Fixed in

✓ 4.9.274 4.9.x ✓ 4.14.238 4.14.x ✓ 4.19.196 4.19.x ✓ 5.4.127 5.4.x ✓ 5.10.45 5.10.x ✓ 5.12.12 5.12.x ✓ 5.13

References

7 total

Kernel Git
https://git.kernel.org/stable/c/1f95741981c899c4724647291fec5faa3c777185

Patch
Kernel Git
https://git.kernel.org/stable/c/5f728ec65485625e30f46e5b4917ff023ad29ea0

Patch
Kernel Git
https://git.kernel.org/stable/c/9fdd04918a452980631ecc499317881c1d120b70

Patch
Kernel Git
https://git.kernel.org/stable/c/c6998ccfefa652bac3f9b236821e392af43efa1e

Patch
Kernel Git
https://git.kernel.org/stable/c/c7836de2cadd88bc2f20f2c5a3d4ef4c73aef627

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2021-47257

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-04-04

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47257?

CVE-2021-47257 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 4.4 onward and has been patched in 4.9.274, 4.14.238, 4.19.196 and others. CVE-2021-47257 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47257?

CVE-2021-47257 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-2021-47257?

Yes. CVE-2021-47257 has been patched. Fixed versions include 4.9.274, 4.14.238, 4.19.196 and others. If you are running Linux kernel 4.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47257 actively exploited?

No. CVE-2021-47257 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.