What is CVE-2021-47495?

CVE-2021-47495 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Divide By Zero flaw (CWE-369), affecting Linux kernel versions from 2.6.12 onward and patched in 4.4.291, 4.9.289, 4.14.254 and others. CVE-2021-47495 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47495?

CVE-2021-47495 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-2021-47495?

Yes, CVE-2021-47495 has been patched. Fixed versions include 4.4.291, 4.9.289, 4.14.254 and others. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47495 actively exploited?

CVE-2021-47495 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Divide By Zero (CWE-369)?

The product divides a value by zero, causing a crash or unexpected behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/369.html

CVE-2021-47495

Medium

In the Linux kernel, the following vulnerability has been resolved: usbnet: sanity check for maxpacket maxpacket of 0 makes no sense and oopses as we need to divide by it. Give up. V2: fixed typo in log and stylistic issues

Package Linux Kernel

Published 2024-05-22

Last modified 2025-09-29

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-369

CVE-2021-47495 is a Divide By Zero vulnerability

What is Divide By Zero?

The product divides a value by zero, causing a crash or unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.12 and later are affected. Fixed in 4.4.291, 4.9.289, 4.14.254, 4.19.215, 5.4.157, 5.10.77, 5.14.16, 5.15 and their respective stable series.

Affected from

≥ 2.6.12

Fixed in

✓ 4.4.291 4.4.x ✓ 4.9.289 4.9.x ✓ 4.14.254 4.14.x ✓ 4.19.215 4.19.x ✓ 5.4.157 5.4.x ✓ 5.10.77 5.10.x ✓ 5.14.16 5.14.x ✓ 5.15

References

8 total

Kernel Git
https://git.kernel.org/stable/c/002d82227c0abe29118cf80f7e2f396b22d448ed

Patch
Kernel Git
https://git.kernel.org/stable/c/397430b50a363d8b7bdda00522123f82df6adc5e

Patch
Kernel Git
https://git.kernel.org/stable/c/492140e45d2bf27c1014243f8616a9b612144e20

Patch
Kernel Git
https://git.kernel.org/stable/c/524f333e98138d909a0a0c574a9ff6737dce2767

Patch
Kernel Git
https://git.kernel.org/stable/c/693ecbe8f799405f8775719deedb1f76265d375a

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2021-47495

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-09-29

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47495?

CVE-2021-47495 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Divide By Zero flaw (CWE-369) . It affects Linux kernel versions from 2.6.12 onward and has been patched in 4.4.291, 4.9.289, 4.14.254 and others. CVE-2021-47495 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47495?

CVE-2021-47495 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-2021-47495?

Yes. CVE-2021-47495 has been patched. Fixed versions include 4.4.291, 4.9.289, 4.14.254 and others. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47495 actively exploited?

No. CVE-2021-47495 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.