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CVE-2025-21903

Estado: AnalizadaMedia (5.5)—

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

mctp i3c: handle NULL header address

daddr can be NULL if there is no neighbour table entry present, in that case the tx packet should be dropped.

saddr will usually be set by MCTP core, but check for NULL in case a packet is transmitted by a different protocol.

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-2025-21903",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "product": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "status": "affected",
              "version": "6.7"
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              "version": "0",
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          "programFiles": [
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          "defaultStatus": "affected"
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  "published": "2025-04-01T16:15:20.757",
  "references": [
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      "url": "https://git.kernel.org/stable/c/740bf9c9b715cc327d34b1e2d4ee79fcd4c47a56",
      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp i3c: handle NULL header address\n\ndaddr can be NULL if there is no neighbour table entry present,\nin that case the tx packet should be dropped.\n\nsaddr will usually be set by MCTP core, but check for NULL in case a\npacket is transmitted by a different protocol."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mctp i3c: gestiona dirección de encabezado NULL. daddr puede ser NULL si no hay ninguna entrada presente en la tabla de vecinos, en ese caso el paquete tx debe descartarse. saddr generalmente será configurado por el núcleo MCTP, pero verifica si es NULL en caso de que un paquete sea transmitido por un protocolo diferente."
    }
  ],
  "lastModified": "2026-06-17T08:44:34.280",
  "configurations": [
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}