FKIE_CVE-2025-68788

Vulnerability from fkie_nvd - Published: 2026-01-13 16:15 - Updated: 2026-04-15 00:35
Severity ?
Summary
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(). 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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/635bc4def026a24e071436f4f356ea08c0eed6ff
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82f7416bcbd951549e758d15fc1a96a5afc2e900
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/859bdf438f01d9aa7f84b09c1202d548c7cad9e8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df2711544b050aba703e6da418c53c7dc5d443ca
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0643d46759db8b84c0504a676043e5e341b6c81
Impacted products
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{
  "cveTags": [],
  "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 s\u00ed 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 a\u00fan pueden hacer stat al archivo y ver si fue accedido/modificado a trav\u00e9s de un cambio en atime/mtime.\n\nLo mismo no es cierto para archivos especiales (p. ej., /dev/null). Los usuarios generalmente no observar\u00e1n cambios en atime/mtime cuando otros usuarios leen/escriben en archivos especiales, solo cuando alguien establece atime/mtime a trav\u00e9s 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 a\u00fan se generan a los observadores padre en utimensat(). Esto cierra algunos canales laterales que podr\u00edan ser posiblemente utilizados para la exfiltraci\u00f3n de informaci\u00f3n [1].\n\n[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf"
    }
  ],
  "id": "CVE-2025-68788",
  "lastModified": "2026-04-15T00:35:42.020",
  "metrics": {},
  "published": "2026-01-13T16:15:58.623",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/635bc4def026a24e071436f4f356ea08c0eed6ff"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/82f7416bcbd951549e758d15fc1a96a5afc2e900"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/859bdf438f01d9aa7f84b09c1202d548c7cad9e8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/df2711544b050aba703e6da418c53c7dc5d443ca"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e0643d46759db8b84c0504a676043e5e341b6c81"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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