CVE-2025-23138
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
watch_queue: fix pipe accounting mismatch
Currently, watch_queue_set_size() modifies the pipe buffers charged to user->pipe_bufs without updating the pipe->nr_accounted on the pipe itself, due to the if (!pipe_has_watch_queue()) test in pipe_resize_ring(). This means that when the pipe is ultimately freed, we decrement user->pipe_bufs by something other than what than we had charged to it, potentially leading to an underflow. This in turn can cause subsequent too_many_pipe_buffers_soft() tests to fail with -EPERM.
To remedy this, explicitly account for the pipe usage in watch_queue_set_size() to match the number set via account_pipe_buffers()
Detalles técnicos trazas, registros y código del informe original
(It's unclear why watch_queue_set_size() does not update nr_accounted; it may be due to intentional overprovisioning in watch_queue_set_size()?)
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: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- 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/205028ebba838938d3b264dda1d0708fa7fe1ade
- https://git.kernel.org/stable/c/2d680b988656bb556c863d8b46d9b9096842bf3d
- https://git.kernel.org/stable/c/471c89b7d4f58bd6082f7c1fe14d4ca15c7f1284
- https://git.kernel.org/stable/c/56ec918e6c86c1536870e4373e91eddd0c44245f
- https://git.kernel.org/stable/c/6dafa27764183738dc5368b669b71e3d0d154f12
- https://git.kernel.org/stable/c/8658c75343ed00e5e154ebbe24335f51ba8db547
- https://git.kernel.org/stable/c/d40e3537265dea9e3c33021874437ff26dc18787
- https://git.kernel.org/stable/c/f13abc1e8e1a3b7455511c4e122750127f6bc9b0
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: fix pipe accounting mismatch\n\nCurrently, watch_queue_set_size() modifies the pipe buffers charged to\nuser->pipe_bufs without updating the pipe->nr_accounted on the pipe\nitself, due to the if (!pipe_has_watch_queue()) test in\npipe_resize_ring(). This means that when the pipe is ultimately freed,\nwe decrement user->pipe_bufs by something other than what than we had\ncharged to it, potentially leading to an underflow. This in turn can\ncause subsequent too_many_pipe_buffers_soft() tests to fail with -EPERM.\n\nTo remedy this, explicitly account for the pipe usage in\nwatch_queue_set_size() to match the number set via account_pipe_buffers()\n\n(It's unclear why watch_queue_set_size() does not update nr_accounted;\nit may be due to intentional overprovisioning in watch_queue_set_size()?)"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: watch_queue: corrección de la discrepancia en la contabilidad de la tubería. Actualmente, watch_queue_set_size() modifica los búferes de la tubería cargados a user->pipe_bufs sin actualizar pipe->nr_accounted en la propia tubería, debido a la prueba if (!pipe_has_watch_queue()) en pipe_resize_ring(). Esto significa que, cuando la tubería se libera finalmente, se decrementa user->pipe_bufs en un valor distinto al que se le había cargado, lo que podría provocar un desbordamiento. Esto, a su vez, puede provocar que las pruebas too_many_pipe_buffers_soft() posteriores fallen con -EPERM. Para remediar esto, tenga en cuenta explícitamente el uso de la tubería en watch_queue_set_size() para que coincida con el número establecido mediante account_pipe_buffers() (no está claro por qué watch_queue_set_size() no actualiza nr_accounted; puede deberse a un exceso de aprovisionamiento intencional en watch_queue_set_size())."
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