FKIE_CVE-2025-38499

Vulnerability from fkie_nvd - Published: 2025-08-11 16:15 - Updated: 2025-11-03 18:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won't expose something hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo" may be a result of MNT_LOCKED on a child, but it may also come from lacking admin rights in the userns of the namespace mount belongs to. clone_private_mnt() checks the former, but not the latter. There's a number of rather confusing CAP_SYS_ADMIN checks in various userns during the mount, especially with the new mount API; they serve different purposes and in case of clone_private_mnt() they usually, but not always end up covering the missing check mentioned above.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36fecd740de2d542d2091d65d36554ee2bcf9c65
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38628ae06e2a37770cd794802a3f1310cf9846e3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c28f922c9dcee0e4876a2c095939d77fe7e15116
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d717325b5ecf2a40daca85c61923e17f32306179
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc6a664089f10eab0fb36b6e4f705022210191d2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e77078e52fbf018ab986efb3c79065ab35025607
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns\n\nWhat we want is to verify there is that clone won\u0027t expose something\nhidden by a mount we wouldn\u0027t be able to undo.  \"Wouldn\u0027t be able to undo\"\nmay be a result of MNT_LOCKED on a child, but it may also come from\nlacking admin rights in the userns of the namespace mount belongs to.\n\nclone_private_mnt() checks the former, but not the latter.\n\nThere\u0027s a number of rather confusing CAP_SYS_ADMIN checks in various\nuserns during the mount, especially with the new mount API; they serve\ndifferent purposes and in case of clone_private_mnt() they usually,\nbut not always end up covering the missing check mentioned above."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: clone_private_mnt(): asegurar que el llamador tenga CAP_SYS_ADMIN en los usuarios correctos. Lo que queremos es verificar que clone no exponga algo oculto por un montaje que no podamos deshacer. \"No se puede deshacer\" puede ser el resultado de MNT_LOCKED en un hijo, pero tambi\u00e9n puede provenir de la falta de derechos de administrador en los usuarios del espacio de nombres al que pertenece el montaje. clone_private_mnt() comprueba lo primero, pero no lo segundo. Hay varias comprobaciones de CAP_SYS_ADMIN bastante confusas en varios usuarios durante el montaje, especialmente con la nueva API de montaje; tienen diferentes prop\u00f3sitos y, en el caso de clone_private_mnt(), generalmente, aunque no siempre, cubren la comprobaci\u00f3n faltante mencionada anteriormente."
    }
  ],
  "id": "CVE-2025-38499",
  "lastModified": "2025-11-03T18:16:25.993",
  "metrics": {},
  "published": "2025-08-11T16:15:30.057",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/36fecd740de2d542d2091d65d36554ee2bcf9c65"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/38628ae06e2a37770cd794802a3f1310cf9846e3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c28f922c9dcee0e4876a2c095939d77fe7e15116"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d717325b5ecf2a40daca85c61923e17f32306179"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc6a664089f10eab0fb36b6e4f705022210191d2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e77078e52fbf018ab986efb3c79065ab35025607"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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