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CVE-2025-21746

Estado: AnalizadaMedia (4.7)—

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

Input: synaptics - fix crash when enabling pass-through port

When enabling a pass-through port an interrupt might come before psmouse driver binds to the pass-through port. However synaptics sub-driver tries to access psmouse instance presumably associated with the pass-through port to figure out if only 1 byte of response or entire protocol packet needs to be forwarded to the pass-through port and may crash if psmouse instance has not been attached to the port yet.

Fix the crash by introducing open() and close() methods for the port and check if the port is open before trying to access psmouse instance.

Leer descripción completaMostrar menos

Because psmouse calls serio_open() only after attaching psmouse instance to serio port instance this prevents the potential crash.

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-2025-21746",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.7,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1
      }
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      "affectedData": [
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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          "programFiles": [
            "drivers/input/mouse/synaptics.c",
            "drivers/input/mouse/synaptics.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
            },
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              "version": "6.6.80",
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              "status": "unaffected",
              "version": "6.12.17",
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            },
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            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/input/mouse/synaptics.c",
            "drivers/input/mouse/synaptics.h"
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          "defaultStatus": "affected"
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      ]
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  ],
  "published": "2025-02-27T03:15:15.243",
  "references": [
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      "url": "https://git.kernel.org/stable/c/08bd5b7c9a2401faabdaa1472d45c7de0755fd7e",
      "tags": [
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ]
    }
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: synaptics - fix crash when enabling pass-through port\n\nWhen enabling a pass-through port an interrupt might come before psmouse\ndriver binds to the pass-through port. However synaptics sub-driver\ntries to access psmouse instance presumably associated with the\npass-through port to figure out if only 1 byte of response or entire\nprotocol packet needs to be forwarded to the pass-through port and may\ncrash if psmouse instance has not been attached to the port yet.\n\nFix the crash by introducing open() and close() methods for the port and\ncheck if the port is open before trying to access psmouse instance.\nBecause psmouse calls serio_open() only after attaching psmouse instance\nto serio port instance this prevents the potential crash."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Entrada: synaptics - arregla el fallo al habilitar el puerto de paso Al habilitar un puerto de paso, puede aparecer una interrupción antes de que el controlador psmouse se vincule al puerto de paso. Sin embargo, el subcontrolador synaptics intenta acceder a la instancia psmouse presuntamente asociada con el puerto de paso para averiguar si solo se necesita reenviar 1 byte de respuesta o el paquete de protocolo completo al puerto de paso y puede bloquearse si la instancia psmouse aún no se ha adjuntado al puerto. Arregla el bloqueo introduciendo los métodos open() y close() para el puerto y comprueba si el puerto está abierto antes de intentar acceder a la instancia psmouse. Debido a que psmouse llama a serio_open() solo después de adjuntar la instancia psmouse a la instancia del puerto serio, esto evita el posible bloqueo."
    }
  ],
  "lastModified": "2026-06-17T08:44:10.730",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
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              "versionEndExcluding": "6.6.80",
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            {
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              "versionEndExcluding": "6.13.3",
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          "operator": "OR"
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}