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CVE-2025-38657

Estado: ModificadaAlta (7.1)—

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

wifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()

The "link_id" value comes from the user via debugfs. If it's larger than BITS_PER_LONG then that would result in shift wrapping and potentially an out of bounds access later. In fact, we can limit it to IEEE80211_MLD_MAX_NUM_LINKS (15).

Fortunately, only root can write to debugfs files so the security impact is minimal.

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 evidencian escalada de privilegios local vía debugfs. El desbordamiento de shift y acceso fuera de límites (CWE-125) permite ejecución de código con permisos elevados.

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
{
  "id": "CVE-2025-38657",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.3,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.5,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
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  "affected": [
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      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "9dd85e739ce0765f022014c3e0713e1007d7ef60",
              "lessThan": "417cfa9cc44fbe6bceab786f9a4ee5a210f1288e",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "9dd85e739ce0765f022014c3e0713e1007d7ef60",
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              "versionType": "git"
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          ],
          "programFiles": [
            "drivers/net/wireless/realtek/rtw89/core.c"
          ],
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        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.16",
              "versionType": "semver"
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            {
              "status": "unaffected",
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          "programFiles": [
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          "defaultStatus": "affected"
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  ],
  "published": "2025-08-22T16:15:40.777",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/417cfa9cc44fbe6bceab786f9a4ee5a210f1288e",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/53cf488927a0f79968f9c03c4d1e00d2a79731c3",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw89: mcc: prevent shift wrapping in rtw89_core_mlsr_switch()\n\nThe \"link_id\" value comes from the user via debugfs.  If it's larger\nthan BITS_PER_LONG then that would result in shift wrapping and\npotentially an out of bounds access later.  In fact, we can limit it\nto IEEE80211_MLD_MAX_NUM_LINKS (15).\n\nFortunately, only root can write to debugfs files so the security\nimpact is minimal."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: rtw89: mcc: impide el ajuste de turnos en rtw89_core_mlsr_switch(). El valor \"link_id\" proviene del usuario a través de debugfs. Si es mayor que BITS_PER_LONG, esto provocaría un ajuste de turnos y, potencialmente, un acceso fuera de los límites posteriormente. De hecho, podemos limitarlo a IEEE80211_MLD_MAX_NUM_LINKS (15). Afortunadamente, solo el usuario root puede escribir en archivos de debugfs, por lo que el impacto en la seguridad es mínimo."
    }
  ],
  "lastModified": "2026-07-30T06:23:33.293",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D6BFC4F7-7099-4420-AF39-DD1CEABB8DF9"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}