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CVE-2025-21810

Estado: ModificadaMedia (5.5)—

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

driver core: class: Fix wild pointer dereferences in API class_dev_iter_next()

There are a potential wild pointer dereferences issue regarding APIs class_dev_iter_(init|next|exit)(), as explained by below typical usage:

// class_dev_iter_init(@iter, @class, ...) checks parameter @class for // potential class_to_subsys() error, and it returns void type and does // not initialize its output parameter @iter, so caller can not detect // the error and continues to invoke class_dev_iter_next(@iter) even if // @iter still contains wild pointers. class_dev_iter_init(&iter, ...);

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Actually, all callers of these APIs have such usage pattern in kernel tree. Fix by: - Initialize output parameter @iter by memset() in class_dev_iter_init() and give callers prompt by pr_crit() for the error. - Check if @iter is valid in class_dev_iter_next().

Detalles técnicos trazas, registros y código del informe original
// All members of @iter are wild pointers.
struct class_dev_iter iter;

// Dereference these wild pointers in @iter here once suffer the error.
while (dev = class_dev_iter_next(&iter)) { ... };

// Also dereference these wild pointers here.
class_dev_iter_exit(&iter);

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-21810",
  "cveTags": [],
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "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",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 1.8
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "programFiles": [
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  "published": "2025-02-27T20:16:03.587",
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-476"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: class: Fix wild pointer dereferences in API class_dev_iter_next()\n\nThere are a potential wild pointer dereferences issue regarding APIs\nclass_dev_iter_(init|next|exit)(), as explained by below typical usage:\n\n// All members of @iter are wild pointers.\nstruct class_dev_iter iter;\n\n// class_dev_iter_init(@iter, @class, ...) checks parameter @class for\n// potential class_to_subsys() error, and it returns void type and does\n// not initialize its output parameter @iter, so caller can not detect\n// the error and continues to invoke class_dev_iter_next(@iter) even if\n// @iter still contains wild pointers.\nclass_dev_iter_init(&iter, ...);\n\n// Dereference these wild pointers in @iter here once suffer the error.\nwhile (dev = class_dev_iter_next(&iter)) { ... };\n\n// Also dereference these wild pointers here.\nclass_dev_iter_exit(&iter);\n\nActually, all callers of these APIs have such usage pattern in kernel tree.\nFix by:\n- Initialize output parameter @iter by memset() in class_dev_iter_init()\n  and give callers prompt by pr_crit() for the error.\n- Check if @iter is valid in class_dev_iter_next()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: núcleo del controlador: clase: Arreglar desreferencias de punteros salvajes en la API class_dev_iter_next() Hay un posible problema de desreferencias de punteros salvajes con respecto a las API class_dev_iter_(init|next|exit()), como se explica a continuación en el uso típico: // Todos los miembros de @iter son punteros salvajes. struct class_dev_iter iter; // class_dev_iter_init(@iter, @class, ...) comprueba el parámetro @class en busca de un posible error class_to_subsys(), y devuelve el tipo void y no inicializa su parámetro de salida @iter, por lo que el llamador no puede detectar el error y continúa invocando class_dev_iter_next(@iter) incluso si @iter todavía contiene punteros salvajes. class_dev_iter_init(&iter, ...); // Desreferencia estos punteros salvajes en @iter aquí una vez que sufre el error. mientras (dev = class_dev_iter_next(&iter)) { ... }; // También desreferencia estos punteros salvajes aquí. class_dev_iter_exit(&iter); En realidad, todos los que llaman a estas API tienen ese patrón de uso en el árbol del kernel. Solucione esto: - Inicialice el parámetro de salida @iter con memset() en class_dev_iter_init() y dé a los que llaman un aviso con pr_crit() para el error. - Verifique si @iter es válido en class_dev_iter_next()."
    }
  ],
  "lastModified": "2026-07-30T06:21:38.610",
  "configurations": [
    {
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}