CVE-2021-47224
"NetX Temac DMA Use-After-Free Vulnerability"
Description
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.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 4, 2025, 2:32 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
2.5
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47224.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47224 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47224 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 04, 2025
Action Type Old Value New Value Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.4.128 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.46 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.13 Added Reference Type CVE: https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358 Added Reference https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47 Added Reference https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3 Added Reference https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Nov. 04, 2024
Action Type Old Value New Value Added CVSS V3.1 CISA-ADP AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 21, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/6d120ab4dc39a543c6b63361e1d0541c382900a3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/019ab7d044d0ebf97e1236bb8935b7809be92358 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/e8afe05bd359ebe12a61dbdc94c06c00ea3e8d4b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/6aa32217a9a446275440ee8724b1ecaf1838df47 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47224 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47224
weaknesses.