CVE-2021-47236
Net-CDC-EEM skb Leak
Description
In the Linux kernel, the following vulnerability has been resolved: net: cdc_eem: fix tx fixup skb leak when usbnet transmit a skb, eem fixup it in eem_tx_fixup(), if skb_copy_expand() failed, it return NULL, usbnet_start_xmit() will have no chance to free original skb. fix it by free orginal skb in eem_tx_fixup() first, then check skb clone status, if failed, return NULL to usbnet.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
April 29, 2025, 7:44 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
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-2021-47236.
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).
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The following list is the news that have been mention
CVE-2021-47236 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47236 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. 29, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-401 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 from (including) 2.6.30 up to (excluding) 4.4.274 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.5 up to (excluding) 4.9.274 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.238 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.196 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 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/05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/14184ec5c958b589ba934da7363a2877879204df Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/14184ec5c958b589ba934da7363a2877879204df Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/1bcacd6088d61c0ac6a990d87975600a81f3247e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1bcacd6088d61c0ac6a990d87975600a81f3247e Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/81de2ed06df8b5451e050fe6a318af3263dbff3f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/81de2ed06df8b5451e050fe6a318af3263dbff3f Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/f12554b0ff639e74612cc01b3b4a049e098d2d65 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f12554b0ff639e74612cc01b3b4a049e098d2d65 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/f4e6a7f19c82f39b1803e91c54718f0d7143767d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f4e6a7f19c82f39b1803e91c54718f0d7143767d 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/05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 Added Reference https://git.kernel.org/stable/c/14184ec5c958b589ba934da7363a2877879204df Added Reference https://git.kernel.org/stable/c/1bcacd6088d61c0ac6a990d87975600a81f3247e Added Reference https://git.kernel.org/stable/c/81de2ed06df8b5451e050fe6a318af3263dbff3f Added Reference https://git.kernel.org/stable/c/b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 Added Reference https://git.kernel.org/stable/c/c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 Added Reference https://git.kernel.org/stable/c/f12554b0ff639e74612cc01b3b4a049e098d2d65 Added Reference https://git.kernel.org/stable/c/f4e6a7f19c82f39b1803e91c54718f0d7143767d -
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: cdc_eem: fix tx fixup skb leak when usbnet transmit a skb, eem fixup it in eem_tx_fixup(), if skb_copy_expand() failed, it return NULL, usbnet_start_xmit() will have no chance to free original skb. fix it by free orginal skb in eem_tx_fixup() first, then check skb clone status, if failed, return NULL to usbnet. Added Reference kernel.org https://git.kernel.org/stable/c/f12554b0ff639e74612cc01b3b4a049e098d2d65 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/14184ec5c958b589ba934da7363a2877879204df [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/1bcacd6088d61c0ac6a990d87975600a81f3247e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f4e6a7f19c82f39b1803e91c54718f0d7143767d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/81de2ed06df8b5451e050fe6a318af3263dbff3f [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 [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-2021-47236 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-2021-47236
weaknesses.