CVE-2025-38067
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
rseq: Fix segfault on registration when rseq_cs is non-zero
The rseq_cs field is documented as being set to 0 by user-space prior to registration, however this is not currently enforced by the kernel. This can result in a segfault on return to user-space if the value stored in the rseq_cs field doesn't point to a valid struct rseq_cs.
The correct solution to this would be to fail the rseq registration when the rseq_cs field is non-zero.
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However, some older versions of glibc will reuse the rseq area of previous threads without clearing the rseq_cs field and will also terminate the process if the rseq registration fails in a secondary thread. This wasn't caught in testing because in this case the leftover rseq_cs does point to a valid struct rseq_cs.
What we can do is clear the rseq_cs field on registration when it's non-zero which will prevent segfaults on registration and won't break the glibc versions that reuse rseq areas on thread creation.
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: 0.57%
- Percentil entre todas las CVEs puntuadas: 45
- 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/2df285dab00fa03a3ef939b6cb0d0d0aeb0791db
- https://git.kernel.org/stable/c/3e4028ef31b69286c9d4878cee0330235f53f218
- https://git.kernel.org/stable/c/48900d839a3454050fd5822e34be8d54c4ec9b86
- https://git.kernel.org/stable/c/b2b05d0dc2f4f0646922068af435aed5763d16ba
- https://git.kernel.org/stable/c/eaf112069a904b6207b4106ff083e0208232a2eb
- https://git.kernel.org/stable/c/f004f58d18a2d3dc761cf973ad27b4a5997bd876
- https://git.kernel.org/stable/c/fd881d0a085fc54354414aed990ccf05f282ba53
- 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\nrseq: Fix segfault on registration when rseq_cs is non-zero\n\nThe rseq_cs field is documented as being set to 0 by user-space prior to\nregistration, however this is not currently enforced by the kernel. This\ncan result in a segfault on return to user-space if the value stored in\nthe rseq_cs field doesn't point to a valid struct rseq_cs.\n\nThe correct solution to this would be to fail the rseq registration when\nthe rseq_cs field is non-zero. However, some older versions of glibc\nwill reuse the rseq area of previous threads without clearing the\nrseq_cs field and will also terminate the process if the rseq\nregistration fails in a secondary thread. This wasn't caught in testing\nbecause in this case the leftover rseq_cs does point to a valid struct\nrseq_cs.\n\nWhat we can do is clear the rseq_cs field on registration when it's\nnon-zero which will prevent segfaults on registration and won't break\nthe glibc versions that reuse rseq areas on thread creation."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rseq: Arreglar violación de segmentación en el registro cuando rseq_cs no es cero El campo rseq_cs está documentado como establecido a 0 por el espacio de usuario antes del registro, sin embargo esto no es aplicado actualmente por el kernel. Esto puede resultar en una violación de segmentación al regresar al espacio de usuario si el valor almacenado en el campo rseq_cs no apunta a una estructura rseq_cs válida. La solución correcta para esto sería fallar el registro de rseq cuando el campo rseq_cs no es cero. Sin embargo, algunas versiones anteriores de glibc reutilizarán el área rseq de subprocesos anteriores sin borrar el campo rseq_cs y también terminarán el proceso si el registro de rseq falla en un subproceso secundario. Esto no fue detectado en las pruebas porque en este caso el rseq_cs restante apunta a una estructura rseq_cs válida. Lo que podemos hacer es borrar el campo rseq_cs durante el registro cuando no sea cero, lo que evitará errores de segmentación en el registro y no dañará las versiones de glibc que reutilizan áreas rseq en la creación de subprocesos."
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