What is CVE-2021-47474?

CVE-2021-47474 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 2.6.31 onward and patched in 4.4.292, 4.9.290, 4.14.255 and others. CVE-2021-47474 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47474?

CVE-2021-47474 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-47474?

Yes, CVE-2021-47474 has been patched. Fixed versions include 4.4.292, 4.9.290, 4.14.255 and others. If you are running Linux kernel 2.6.31 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47474 actively exploited?

CVE-2021-47474 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2021-47474

High

In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix bulk-buffer overflow The driver is using endpoint-sized buffers but must not assume that the tx and rx buffers are of equal size or a malicious device could overflow the slab-allocated receive buffer when doing bulk transfers.

Package Linux Kernel

Published 2024-05-22

Last modified 2025-09-24

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-787

CVE-2021-47474 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.31 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

≥ 2.6.31

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/063f576c43d589a4c153554b681d32b3f8317c7b

Patch
Kernel Git
https://git.kernel.org/stable/c/0866dcaa828c21bc2f94dac00e086078f11b5772

Patch
Kernel Git
https://git.kernel.org/stable/c/1ae4715121a57bc6fa29fd992127b01907f2f993

Patch
Kernel Git
https://git.kernel.org/stable/c/47b4636ebdbeba2044b3db937c4d2b6a4fe3d0f2

Patch
Kernel Git
https://git.kernel.org/stable/c/78cdfd62bd54af615fba9e3ca1ba35de39d3871d

Patch

Showing 5 of 9 references View all on NVD

Details

CVE ID CVE-2021-47474

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-09-24

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47474?

CVE-2021-47474 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 2.6.31 onward and has been patched in 4.4.292, 4.9.290, 4.14.255 and others. CVE-2021-47474 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47474?

CVE-2021-47474 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-47474?

Yes. CVE-2021-47474 has been patched. Fixed versions include 4.4.292, 4.9.290, 4.14.255 and others. If you are running Linux kernel 2.6.31 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47474 actively exploited?

No. CVE-2021-47474 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.