// For flags

CVE-2021-47361

mcb: fix error handling in mcb_alloc_bus()

Severity Score

7.8
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs:
1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free.
2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mcb: corrige el manejo de errores en mcb_alloc_bus() Hay dos errores: 1) Si ida_simple_get() falla, entonces este código llama a put_device(carrier) pero aún no hemos llamado a get_device( transportista) y probablemente eso conduzca a un uso posterior gratuito. 2) Después de device_initialize() entonces necesitamos usar put_device() para liberar el bus. Esto liberará los recursos internos vinculados al dispositivo y llamará a mcb_free_bus() que liberará el resto.

In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.

*Credits: N/A
CVSS Scores
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
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-21 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
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"
 >= 4.7 < 4.9.285
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 4.9.285"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.7 < 4.14.249
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 4.14.249"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.7 < 4.19.209
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 4.19.209"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.7 < 5.4.150
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 5.4.150"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.7 < 5.10.70
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 5.10.70"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.7 < 5.14.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 5.14.9"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 4.7 < 5.15
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.7 < 5.15"
en
Affected