// For flags

CVE-2024-36896

USB: core: Fix access violation during port device removal

Severity Score

9.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

USB: core: Fix access violation during port device removal

Testing with KASAN and syzkaller revealed a bug in port.c:disable_store():
usb_hub_to_struct_hub() can return NULL if the hub that the port belongs to
is concurrently removed, but the function does not check for this
possibility before dereferencing the returned value.

It turns out that the first dereference is unnecessary, since hub->intfdev
is the parent of the port device, so it can be changed easily. Adding a
check for hub == NULL prevents further problems.

The same bug exists in the disable_show() routine, and it can be fixed the
same way.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: USB: core: corrige la infracción de acceso durante la eliminación del dispositivo del puerto. Las pruebas con KASAN y syzkaller revelaron un error en port.c:disable_store(): usb_hub_to_struct_hub() puede devolver NULL si el hub que el puerto al que pertenece se elimina simultáneamente, pero la función no comprueba esta posibilidad antes de desreferenciar el valor devuelto. Resulta que la primera desreferencia es innecesaria, ya que hub->intfdev es el padre del dispositivo portuario, por lo que se puede cambiar fácilmente. Agregar una verificación para hub == NULL evita más problemas. El mismo error existe en la rutina enable_show() y se puede solucionar de la misma manera.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-30 CVE Reserved
  • 2024-05-30 CVE Published
  • 2024-05-31 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-170: Improper Null Termination
  • CWE-476: NULL Pointer Dereference
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"
 >= 6.0 < 6.1.91
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.0 < 6.1.91"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.0 < 6.6.31
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.0 < 6.6.31"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.0 < 6.8.10
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.0 < 6.8.10"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 6.0 < 6.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.0 < 6.9"
en
Affected