What is CVE-2021-47224?

CVE-2021-47224 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.2 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 2.6.31 onward and patched in 5.4.128, 5.10.46, 5.12.13 and others. CVE-2021-47224 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47224?

CVE-2021-47224 has a CVSS score of 6.2 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47224?

Yes, CVE-2021-47224 has been patched. Fixed versions include 5.4.128, 5.10.46, 5.12.13 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-2021-47224 actively exploited?

CVE-2021-47224 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2021-47224

Medium

In the Linux kernel, the following vulnerability has been resolved: net: ll_temac: Make sure to free skb when it is completely used With the skb pointer piggy-backed on the TX BD, we have a simple and efficient way to free the skb buffer when the frame has been transmitted. But in order to avoid freeing the skb while there are still fragments from the skb in use, we need to piggy-back on the TX BD of the skb, not the first. Without this, we are doing use-after-free on the DMA side, when the first BD of a multi TX BD packet is seen as completed in xmit_done, and the remaining BDs are still being processed.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-04-04

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

6.2

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2021-47224 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.31 and later are affected. Fixed in 5.4.128, 5.10.46, 5.12.13, 5.13 and their respective stable series.

Affected from

≥ 2.6.31

Fixed in

✓ 5.4.128 5.4.x ✓ 5.10.46 5.10.x ✓ 5.12.13 5.12.x ✓ 5.13

References

4 total

Kernel Git
https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358

Patch
Kernel Git
https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47

Patch
Kernel Git
https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3

Patch
Kernel Git
https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b

Patch

Details

CVE ID CVE-2021-47224

Severity Medium

CVSS score 6.2 / 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-2021-47224?

CVE-2021-47224 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.2 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 2.6.31 onward and has been patched in 5.4.128, 5.10.46, 5.12.13 and others. CVE-2021-47224 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47224?

CVE-2021-47224 has a CVSS score of 6.2 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47224?

Yes. CVE-2021-47224 has been patched. Fixed versions include 5.4.128, 5.10.46, 5.12.13 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-2021-47224 actively exploited?

No. CVE-2021-47224 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.