// For flags

CVE-2021-47528

usb: cdnsp: Fix a NULL pointer dereference in cdnsp_endpoint_init()

Severity Score

5.5
*CVSS v3.1

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:

usb: cdnsp: Fix a NULL pointer dereference in cdnsp_endpoint_init()

In cdnsp_endpoint_init(), cdnsp_ring_alloc() is assigned to pep->ring
and there is a dereference of it in cdnsp_endpoint_init(), which could
lead to a NULL pointer dereference on failure of cdnsp_ring_alloc().

Fix this bug by adding a check of pep->ring.

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_USB_CDNSP_GADGET=y show no new warnings,
and our static analyzer no longer warns about this code.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: cdnsp: corrige una desreferencia de puntero NULL en cdnsp_endpoint_init() En cdnsp_endpoint_init(), cdnsp_ring_alloc() se asigna a pep->ring y hay una desreferencia del mismo en cdnsp_endpoint_init( ), lo que podría provocar una desreferencia del puntero NULL en caso de falla de cdnsp_ring_alloc(). Corrija este error agregando una marca de pep->ring. Este error fue encontrado por un analizador estático. El análisis emplea verificación diferencial para identificar operaciones de seguridad inconsistentes (por ejemplo, comprobaciones o kfrees) entre dos rutas de código y confirma que las operaciones inconsistentes no se recuperan en la función actual o en las personas que llaman, por lo que constituyen errores. Tenga en cuenta que, como error encontrado mediante análisis estático, puede ser un falso positivo o difícil de activar. Varios investigadores han realizado una revisión cruzada del error. Las compilaciones con CONFIG_USB_CDNSP_GADGET=y no muestran nuevas advertencias y nuestro analizador estático ya no advierte sobre este código.

*Credits: N/A
CVSS Scores
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:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-24 CVE Reserved
  • 2024-05-24 CVE Published
  • 2024-05-25 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • 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"
 >= 5.12 < 5.15.7
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.15.7"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.12 < 5.16
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.16"
en
Affected