CVE-2021-47239

net: usb: fix possible use-after-free in smsc75xx_bind

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved: net: usb: fix possible use-after-free in smsc75xx_bind The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind")
fails to clean up the work scheduled in smsc75xx_reset->
smsc75xx_set_multicast, which leads to use-after-free if the work is
scheduled to start after the deallocation. In addition, this patch
also removes a dangling pointer - dev->data[0]. This patch calls cancel_work_sync to cancel the scheduled work and set
the dangling pointer to NULL.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net:usb: corrige posible use after free en smsc75xx_bind. La confirmación 46a8b29c6306 ("net:usb: corrige la pérdida de memoria en smsc75xx_bind") no logra limpiar el trabajo programado en smsc75xx_reset -> smsc75xx_set_multicast, lo que genera use after free si el trabajo está programado para comenzar después de la desasignación. Además, este parche también elimina un puntero colgante: dev->data[0]. Este parche llama a cancel_work_sync para cancelar el trabajo programado y establecer el puntero colgante en NULL.

In the Linux kernel, the following vulnerability has been resolved: net: usb: fix possible use-after-free in smsc75xx_bind The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind") fails to clean up the work scheduled in smsc75xx_reset-> smsc75xx_set_multicast, which leads to use-after-free if the work is scheduled to start after the deallocation. In addition, this patch also removes a dangling pointer - dev->data[0]. This patch calls cancel_work_sync to cancel the scheduled work and set the dangling pointer to NULL.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-04-10 CVE Reserved
2024-05-21 CVE Published
2024-12-19 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (15)

URL	Tag	Source
https://git.kernel.org/stable/c/200dbfcad8011e50c3cec269ed7b980836eeb1fa	Vuln. Introduced
https://git.kernel.org/stable/c/22c840596af0c09068b6cf948616e6496e59e07f	Vuln. Introduced
https://git.kernel.org/stable/c/9e6b8c1ff9d997e1fa16cbd2d60739adf6dc1bbc	Vuln. Introduced
https://git.kernel.org/stable/c/9e6a3eccb28779710cbbafc4f4258d92509c6d07	Vuln. Introduced
https://git.kernel.org/stable/c/b95fb96e6339e34694dd578fb6bde3575b01af17	Vuln. Introduced
https://git.kernel.org/stable/c/635ac38b36255d3cfb8312cf7c471334f4d537e0	Vuln. Introduced
https://git.kernel.org/stable/c/70c886ac93f87ae7214a0c69151a28a8075dd95b	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b	2021-06-30
https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504	2021-06-30
https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b	2021-06-30
https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b	2021-06-30
https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b	2021-06-23
https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb	2021-06-23
https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d	2021-06-23
https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d	2021-06-16

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.4.271 < 4.4.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.271 < 4.4.274"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.9.271 < 4.9.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.271 < 4.9.274"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.14.235 < 4.14.238 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14.235 < 4.14.238"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.19.193 < 4.19.196 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.193 < 4.19.196"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.4.124 < 5.4.128 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.124 < 5.4.128"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10.42 < 5.10.46 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10.42 < 5.10.46"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.12.9 < 5.12.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12.9 < 5.12.13"		en		Affected