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CVE-2022-50034

Estado: AnalizadaAlta (7.8)—

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

usb: cdns3 fix use-after-free at workaround 2

cdns3_gadget_ep_free_request() free the space pointed by priv_req, but priv_req is used in the following list_del_init().

This patch move list_del_init() before cdns3_gadget_ep_free_request().

Detalles técnicos trazas, registros y código del informe original
BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac

cdns3_wa2_remove_old_request()
{
	...
	kfree(priv_req->request.buf);
	cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request);
	list_del_init(&priv_req->list);
	^^^ use after free
	...
}

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:L/PR:L sin UI indica escalada local. Use-after-free (CWE-416) en kernel USB puede permitir ejecución de código, pero el parche muestra error de memoria sin exploitabilidad demostrada explícitamente.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
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  "published": "2025-06-18T11:15:31.790",
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdns3 fix use-after-free at workaround 2\n\nBUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac\n\ncdns3_wa2_remove_old_request()\n{\n\t...\n\tkfree(priv_req->request.buf);\n\tcdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request);\n\tlist_del_init(&priv_req->list);\n\t^^^ use after free\n\t...\n}\n\ncdns3_gadget_ep_free_request() free the space pointed by priv_req,\nbut priv_req is used in the following list_del_init().\n\nThis patch move list_del_init() before cdns3_gadget_ep_free_request()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: cdns3 corrige el Use-After-Free en la solución alternativa 2 ERROR: KFENCE: Use-After-Free en __list_del_entry_valid+0x10/0xac cdns3_wa2_remove_old_request() { ... kfree(priv_req->request.buf); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); ^^^ Use-After-Free ... } cdns3_gadget_ep_free_request() libera el espacio apuntado por priv_req, pero priv_req se usa en el siguiente list_del_init(). Este parche mueve list_del_init() antes de cdns3_gadget_ep_free_request()."
    }
  ],
  "lastModified": "2026-08-15T13:17:30.473",
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