CVE-2021-47013
net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
Description
In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later.
INFO
Published Date :
Feb. 28, 2024, 9:15 a.m.
Last Modified :
Dec. 9, 2024, 5:59 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the Linux kernel packages.
- Reboot the system after the update.
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-2021-47013.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47013 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-2021-47013
weaknesses.
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-2021-47013 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47013 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.
-
Initial Analysis by [email protected]
Dec. 09, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE NIST CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.9 up to (excluding) 4.9.269 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.10 up to (excluding) 4.14.233 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.191 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.119 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.37 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.4 Changed Reference Type https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 No Types Assigned https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 Patch Changed Reference Type https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 No Types Assigned https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 Patch Changed Reference Type https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d No Types Assigned https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d Patch Changed Reference Type https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d No Types Assigned https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d Patch Changed Reference Type https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 No Types Assigned https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 Patch Changed Reference Type https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 No Types Assigned https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 Patch Changed Reference Type https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 No Types Assigned https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 Patch Changed Reference Type https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 No Types Assigned https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 Patch Changed Reference Type https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d No Types Assigned https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d Patch Changed Reference Type https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d No Types Assigned https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d Patch Changed Reference Type https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 No Types Assigned https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 Patch Changed Reference Type https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 No Types Assigned https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 Patch Changed Reference Type https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 No Types Assigned https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 Patch Changed Reference Type https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 No Types Assigned https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 Patch Changed Reference Type https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b No Types Assigned https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b Patch Changed Reference Type https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b No Types Assigned https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b 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/16d8c44be52e3650917736d45f5904384a9da834 Added Reference https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d Added Reference https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 Added Reference https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 Added Reference https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d Added Reference https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 Added Reference https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 Added Reference https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 28, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..). If some error happens in emac_tx_fill_tpd(), the skb will be freed via dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd(). But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len). As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len, thus my patch assigns skb->len to 'len' before the possible free and use 'len' instead of skb->len later. Added Reference Linux https://git.kernel.org/stable/c/c7f75d11fe72913d2619f97b2334b083cd7bb955 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/dc1b438a35773d030be0ee80d9c635c3e558a322 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/16d8c44be52e3650917736d45f5904384a9da834 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/55fcdd1258faaecca74b91b88cc0921f9edd775d [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/9dc373f74097edd0e35f3393d6248eda8d1ba99d [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/8c06f34785068b87e2b560534c77c163d6c6dca7 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/e407495ba6788a67d1bd41714158c079e340879b [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/6d72e7c767acbbdd44ebc7d89c6690b405b32b57 [No types assigned]