What is CVE-2021-47476?

CVE-2021-47476 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.6 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 3.18 onward and patched in 4.4.292, 4.9.290, 4.14.255 and others. CVE-2021-47476 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47476?

CVE-2021-47476 has a CVSS score of 4.6 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47476?

Yes, CVE-2021-47476 has been patched. Fixed versions include 4.4.292, 4.9.290, 4.14.255 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-2021-47476 actively exploited?

CVE-2021-47476 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-2021-47476

Medium

In the Linux kernel, the following vulnerability has been resolved: comedi: ni_usb6501: fix NULL-deref in command paths The driver uses endpoint-sized USB transfer buffers but had no sanity checks on the sizes. This can lead to zero-size-pointer dereferences or overflowed transfer buffers in ni6501_port_command() and ni6501_counter_command() if a (malicious) device has smaller max-packet sizes than expected (or when doing descriptor fuzz testing). Add the missing sanity checks to probe().

Package Linux Kernel

Published 2024-05-22

Last modified 2025-04-02

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

4.6

out of 10

Medium

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-476

CVE-2021-47476 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 3.18 and later are affected. Fixed in 4.4.292, 4.9.290, 4.14.255, 4.19.217, 5.4.159, 5.10.79, 5.14.18, 5.15.2, 5.16 and their respective stable series.

Affected from

≥ 3.18

Fixed in

✓ 4.4.292 4.4.x ✓ 4.9.290 4.9.x ✓ 4.14.255 4.14.x ✓ 4.19.217 4.19.x ✓ 5.4.159 5.4.x ✓ 5.10.79 5.10.x ✓ 5.14.18 5.14.x ✓ 5.15.2 5.15.x ✓ 5.16

References

9 total

Kernel Git
https://git.kernel.org/stable/c/4a9d43cb5d5f39fa39fc1da438517004cc95f7ea

Patch
Kernel Git
https://git.kernel.org/stable/c/58478143771b20ab219937b1c30a706590a59224

Patch
Kernel Git
https://git.kernel.org/stable/c/907767da8f3a925b060c740e0b5c92ea7dbec440

Patch
Kernel Git
https://git.kernel.org/stable/c/aa39738423503825625853b643b9e99d11c23816

Patch
Kernel Git
https://git.kernel.org/stable/c/b0156b7c9649d8f55a2ce3d3258509f1b2a181c3

Patch

Showing 5 of 9 references View all on NVD

Details

CVE ID CVE-2021-47476

Severity Medium

CVSS score 4.6 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-04-02

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47476?

CVE-2021-47476 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.6 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 3.18 onward and has been patched in 4.4.292, 4.9.290, 4.14.255 and others. CVE-2021-47476 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47476?

CVE-2021-47476 has a CVSS score of 4.6 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47476?

Yes. CVE-2021-47476 has been patched. Fixed versions include 4.4.292, 4.9.290, 4.14.255 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-2021-47476 actively exploited?

No. CVE-2021-47476 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.