CVE-2025-38499
Estado: ModificadaMedia (5.5)—
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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 4
- Fecha de la puntuación: 6/10/2026
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 (2)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/36fecd740de2d542d2091d65d36554ee2bcf9c65
- https://git.kernel.org/stable/c/38628ae06e2a37770cd794802a3f1310cf9846e3
- https://git.kernel.org/stable/c/c28f922c9dcee0e4876a2c095939d77fe7e15116
- https://git.kernel.org/stable/c/d717325b5ecf2a40daca85c61923e17f32306179
- https://git.kernel.org/stable/c/dc6a664089f10eab0fb36b6e4f705022210191d2
- https://git.kernel.org/stable/c/e77078e52fbf018ab986efb3c79065ab35025607
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
Mostrar
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"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't expose something\nhidden by a mount we wouldn't be able to undo. \"Wouldn't 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's 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."
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