CVE-2025-38231
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
nfsd: Initialize ssc before laundromat_work to prevent NULL dereference
In nfs4_state_start_net(), laundromat_work may access nfsd_ssc through nfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized, this can cause NULL pointer dereference.
Normally the delayed start of laundromat_work allows sufficient time for nfsd_ssc initialization to complete. However, when the kernel waits too long for userspace responses (e.g. in nfs4_state_start_net -> nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done -> cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the delayed work may start before nfsd_ssc initialization finishes.
Leer descripción completaMostrar menos
Fix this by moving nfsd_ssc initialization before starting laundromat_work.
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: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- Fecha de la puntuación: 5/10/2026
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
- CWE-476
Referencias
- https://git.kernel.org/stable/c/0fccf5f01ed28725cc313a66ca1247eef911d55e
- https://git.kernel.org/stable/c/5060e1a5fef184bd11d298e3f0ee920d96a23236
- https://git.kernel.org/stable/c/83ac1ba8ca102ab5c0ed4351f8ac6e74ac4d5d64
- https://git.kernel.org/stable/c/a97668ec6d73dab237cd1c15efe012a10090a4ed
- https://git.kernel.org/stable/c/b31da62889e6d610114d81dc7a6edbcaa503fcf8
- https://git.kernel.org/stable/c/d622c2ee6c08147ab8c9b9e37d93b6e95d3258e0
- https://git.kernel.org/stable/c/deaeb74ae9318252829c59a84a7d2316fc335660
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- 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\nnfsd: Initialize ssc before laundromat_work to prevent NULL dereference\n\nIn nfs4_state_start_net(), laundromat_work may access nfsd_ssc through\nnfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized,\nthis can cause NULL pointer dereference.\n\nNormally the delayed start of laundromat_work allows sufficient time for\nnfsd_ssc initialization to complete. However, when the kernel waits too\nlong for userspace responses (e.g. in nfs4_state_start_net ->\nnfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done ->\ncld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the\ndelayed work may start before nfsd_ssc initialization finishes.\n\nFix this by moving nfsd_ssc initialization before starting laundromat_work."
},
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: Inicializar ssc antes de laundromat_work para evitar la desreferencia de punteros NULL. En nfs4_state_start_net(), laundromat_work puede acceder a nfsd_ssc a través de nfs4_laundromat -> nfsd4_ssc_expire_umount. Si nfsd_ssc no se inicializa, esto puede causar la desreferencia de punteros NULL. Normalmente, el inicio retrasado de laundromat_work permite que la inicialización de nfsd_ssc se complete con tiempo suficiente. Sin embargo, cuando el núcleo espera demasiado tiempo las respuestas del espacio de usuario (p. ej., en la ruta nfs4_state_start_net -> nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done -> cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion), el trabajo retrasado puede comenzar antes de que finalice la inicialización de nfsd_ssc. Para solucionar esto, mueva la inicialización de nfsd_ssc antes de iniciar laundromat_work."
}
],
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