What is CVE-2021-47671?

CVE-2021-47671 is a Low severity Linux kernel vulnerability with a CVSS score of 3.3 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 5.13 onward and patched in 5.14.19, 5.15.3 and 5.16. CVE-2021-47671 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47671?

CVE-2021-47671 has a CVSS score of 3.3 out of 10, rated Low severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Is there a patch available for CVE-2021-47671?

Yes, CVE-2021-47671 has been patched. Fixed versions include 5.14.19, 5.15.3 and 5.16. If you are running Linux kernel 5.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47671 actively exploited?

CVE-2021-47671 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2021-47671

Low

In the Linux kernel, the following vulnerability has been resolved: can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path In es58x_rx_err_msg(), if can->do_set_mode() fails, the function directly returns without calling netif_rx(skb). This means that the skb previously allocated by alloc_can_err_skb() is not freed. In other terms, this is a memory leak. This patch simply removes the return statement in the error branch and let the function continue. Issue was found with GCC -fanalyzer, please follow the link below for details.

Package Linux Kernel

Published 2025-04-17

Last modified 2025-04-21

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

3.3

out of 10

Low

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Vector string

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

Weakness type

CWE-401

CVE-2021-47671 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.13 and later are affected. Fixed in 5.14.19, 5.15.3, 5.16 and their respective stable series.

Affected from

≥ 5.13

Fixed in

✓ 5.14.19 5.14.x ✓ 5.15.3 5.15.x ✓ 5.16

References

The following references provide additional information about CVE-2021-47671 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/4f389e1276a5389c92cef860c9fde8e1c802a871
Patch
Kernel patch commit
https://git.kernel.org/stable/c/7eb0881aec26099089f12ae850aebd93190b1dfe
Patch
Kernel patch commit
https://git.kernel.org/stable/c/d9447f768bc8c60623e4bb3ce65b8f4654d33a50
Patch

Details

CVE ID CVE-2021-47671

Severity Low

CVSS score 3.3 / 10

CVSS version 3.1

Published 2025-04-17

Modified 2025-04-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47671?

CVE-2021-47671 is a Low severity Linux kernel vulnerability with a CVSS score of 3.3 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 5.13 onward and has been patched in 5.14.19, 5.15.3 and 5.16. CVE-2021-47671 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47671?

CVE-2021-47671 has a CVSS score of 3.3 out of 10, rated Low 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:L.
Is there a patch available for CVE-2021-47671?

Yes — CVE-2021-47671 has been patched. Fixed versions include 5.14.19, 5.15.3 and 5.16. If you are running Linux kernel 5.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47671 actively exploited?

No — CVE-2021-47671 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. View CWE-401 on MITRE CWE →