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CVE-2025-68788

Estado: AplazadaSin puntuar—

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

fsnotify: do not generate ACCESS/MODIFY events on child for special files

inotify/fanotify do not allow users with no read access to a file to subscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the same user to subscribe for watching events on children when the user has access to the parent directory (e.g. /dev).

Users with no read access to a file but with read access to its parent directory can still stat the file and see if it was accessed/modified via atime/mtime change.

The same is not true for special files (e.g. /dev/null). Users will not generally observe atime/mtime changes when other users read/write to special files, only when someone sets atime/mtime via utimensat().

Leer descripción completaMostrar menos

Align fsnotify events with this stat behavior and do not generate ACCESS/MODIFY events to parent watchers on read/write of special files. The events are still generated to parent watchers on utimensat(). This closes some side-channels that could be possibly used for information exfiltration [1].

[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-68788",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-68788",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-16T16:22:25.274360Z"
        }
      }
    ]
  },
  "affected": [
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      "affectedData": [
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          "programFiles": [
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              "version": "2.6.36"
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            {
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              "version": "0",
              "lessThan": "2.6.36",
              "versionType": "semver"
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              "version": "5.10.248",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
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              "version": "6.6.120",
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            },
            {
              "status": "unaffected",
              "version": "6.12.64",
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            },
            {
              "status": "unaffected",
              "version": "6.18.3",
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            },
            {
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              "version": "6.19",
              "versionType": "original_commit_for_fix",
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          ],
          "programFiles": [
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          ],
          "defaultStatus": "affected"
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      ]
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
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              "version": "V3.1.6",
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          ],
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        {
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          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
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              "lessThan": "*",
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        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
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  "published": "2026-01-13T16:15:58.623",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/635bc4def026a24e071436f4f356ea08c0eed6ff",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsnotify: do not generate ACCESS/MODIFY events on child for special files\n\ninotify/fanotify do not allow users with no read access to a file to\nsubscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the\nsame user to subscribe for watching events on children when the user\nhas access to the parent directory (e.g. /dev).\n\nUsers with no read access to a file but with read access to its parent\ndirectory can still stat the file and see if it was accessed/modified\nvia atime/mtime change.\n\nThe same is not true for special files (e.g. /dev/null). Users will not\ngenerally observe atime/mtime changes when other users read/write to\nspecial files, only when someone sets atime/mtime via utimensat().\n\nAlign fsnotify events with this stat behavior and do not generate\nACCESS/MODIFY events to parent watchers on read/write of special files.\nThe events are still generated to parent watchers on utimensat(). This\ncloses some side-channels that could be possibly used for information\nexfiltration [1].\n\n[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfsnotify: no generar eventos ACCESS/MODIFY en el hijo para archivos especiales\n\ninotify/fanotify no permiten a los usuarios sin acceso de lectura a un archivo suscribirse a eventos (p. ej., IN_ACCESS/IN_MODIFY), pero sí permiten al mismo usuario suscribirse para observar eventos en los hijos cuando el usuario tiene acceso al directorio padre (p. ej., /dev).\n\nLos usuarios sin acceso de lectura a un archivo pero con acceso de lectura a su directorio padre aún pueden hacer stat al archivo y ver si fue accedido/modificado a través de un cambio en atime/mtime.\n\nLo mismo no es cierto para archivos especiales (p. ej., /dev/null). Los usuarios generalmente no observarán cambios en atime/mtime cuando otros usuarios leen/escriben en archivos especiales, solo cuando alguien establece atime/mtime a través de utimensat().\n\nAlinear los eventos de fsnotify con este comportamiento de stat y no generar eventos ACCESS/MODIFY a los observadores padre en la lectura/escritura de archivos especiales. Los eventos aún se generan a los observadores padre en utimensat(). Esto cierra algunos canales laterales que podrían ser posiblemente utilizados para la exfiltración de información [1].\n\n[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf"
    }
  ],
  "lastModified": "2026-07-14T13:18:00.363",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}