CVE-2025-23138
Full vulnerability record from the local CVENow database.
Description
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() (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()?)
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-04-16 15:16:08.163000
Last modified
2026-11-05 21:17:49.887000
View original CVE JSON
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"id": "CVE-2025-23138",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-04-16T15:16:08.163",
"lastModified": "2026-11-05T21:17:49.887",
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"lang": "en",
"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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{
"lang": "es",
"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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