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CVE-2025-21676

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

net: fec: handle page_pool_dev_alloc_pages error

The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did not handle the case when it returned NULL. There was a WARN_ON(!new_page) but it would still proceed to use the NULL pointer and then crash.

This case does seem somewhat rare but when the system is under memory pressure it can happen. One case where I can duplicate this with some frequency is when writing over a smbd share to a SATA HDD attached to an imx6q.

Setting /proc/sys/vm/min_free_kbytes to higher values also seems to solve the problem for my test case. But it still seems wrong that the fec driver ignores the memory allocation error and can crash.

Leer descripción completaMostrar menos

This commit handles the allocation error by dropping the current packet.

CVSS

Probabilidad de explotación (EPSS)

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fec: handle page_pool_dev_alloc_pages error\n\nThe fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did\nnot handle the case when it returned NULL. There was a WARN_ON(!new_page)\nbut it would still proceed to use the NULL pointer and then crash.\n\nThis case does seem somewhat rare but when the system is under memory\npressure it can happen. One case where I can duplicate this with some\nfrequency is when writing over a smbd share to a SATA HDD attached to an\nimx6q.\n\nSetting /proc/sys/vm/min_free_kbytes to higher values also seems to solve\nthe problem for my test case. But it still seems wrong that the fec driver\nignores the memory allocation error and can crash.\n\nThis commit handles the allocation error by dropping the current packet."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: fec: handle page_pool_dev_alloc_pages error La función fec_enet_update_cbd llama a page_pool_dev_alloc_pages pero no gestionó el caso cuando devolvió NULL. Hubo un WARN_ON(!new_page) pero aún así procedería a usar el puntero NULL y luego fallaría. Este caso parece algo raro, pero cuando el sistema está bajo presión de memoria puede suceder. Un caso en el que puedo duplicar esto con cierta frecuencia es cuando escribo sobre un recurso compartido smbd en un HDD SATA conectado a un imx6q. Establecer /proc/sys/vm/min_free_kbytes en valores más altos también parece resolver el problema para mi caso de prueba. Pero todavía parece incorrecto que el controlador fec ignore el error de asignación de memoria y pueda fallar. Esta confirmación gestiona el error de asignación descartando el paquete actual."
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