CVE-2021-47583

media: mxl111sf: change mutex_init() location

Severity Score

"-"

*CVSS v-

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:

media: mxl111sf: change mutex_init() location

Syzbot reported, that mxl111sf_ctrl_msg() uses uninitialized
mutex. The problem was in wrong mutex_init() location.

Previous mutex_init(&state->msg_lock) call was in ->init() function, but
dvb_usbv2_init() has this order of calls:

dvb_usbv2_init()
dvb_usbv2_adapter_init()
dvb_usbv2_adapter_frontend_init()
props->frontend_attach()

props->init()

Since mxl111sf_* devices call mxl111sf_ctrl_msg() in ->frontend_attach()
internally we need to initialize state->msg_lock before
frontend_attach(). To achieve it, ->probe() call added to all mxl111sf_*
devices, which will simply initiaize mutex.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: medio: mxl111sf: cambiar la ubicación de mutex_init() Syzbot informó que mxl111sf_ctrl_msg() usa un mutex no inicializado. El problema estaba en la ubicación mutex_init() incorrecta. La llamada anterior a mutex_init(&state->msg_lock) estaba en la función ->init(), pero dvb_usbv2_init() tiene este orden de llamadas: dvb_usbv2_init() dvb_usbv2_adapter_init() dvb_usbv2_adapter_frontend_init() props->frontend_attach() props->init() Desde Los dispositivos mxl111sf_* llaman a mxl111sf_ctrl_msg() en ->frontend_attach() internamente, necesitamos inicializar state->msg_lock antes de frontend_attach(). Para lograrlo, se agrega la llamada ->probe() a todos los dispositivos mxl111sf_*, lo que simplemente iniciará el mutex.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-24 CVE Reserved
2024-06-19 CVE Published
2024-11-04 CVE Updated
2024-11-08 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/8572211842afc53c8450fb470f2b8d02ba7592e0	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/4b2d9600b31f9ba7adbc9f3c54a068615d27b390	2021-12-22
https://git.kernel.org/stable/c/96f182c9f48b984447741f054ec301fdc8517035	2021-12-22
https://git.kernel.org/stable/c/b99bdf127af91d53919e96292c05f737c45ea59a	2021-12-22
https://git.kernel.org/stable/c/8c6fdf62bfe1bc72bfceeaf832ef7499c7ed09ba	2021-12-22
https://git.kernel.org/stable/c/44870a9e7a3c24acbb3f888b2a7cc22c9bdf7e7f	2021-09-30

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"				>= 3.7 < 4.19.222 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 4.19.222"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.4.168 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.4.168"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.10.88 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.10.88"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.15.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.15.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.16"		en		Affected