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CVE-2022-49654

Estado: AnalizadaMedia (5.5)—

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

net: dsa: qca8k: reset cpu port on MTU change

It was discovered that the Documentation lacks of a fundamental detail on how to correctly change the MAX_FRAME_SIZE of the switch.

In fact if the MAX_FRAME_SIZE is changed while the cpu port is on, the switch panics and cease to send any packet. This cause the mgmt ethernet system to not receive any packet (the slow fallback still works) and makes the device not reachable. To recover from this a switch reset is required.

To correctly handle this, turn off the cpu ports before changing the MAX_FRAME_SIZE and turn on again after the value is applied.

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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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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  "published": "2025-02-26T07:01:40.510",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: qca8k: reset cpu port on MTU change\n\nIt was discovered that the Documentation lacks of a fundamental detail\non how to correctly change the MAX_FRAME_SIZE of the switch.\n\nIn fact if the MAX_FRAME_SIZE is changed while the cpu port is on, the\nswitch panics and cease to send any packet. This cause the mgmt ethernet\nsystem to not receive any packet (the slow fallback still works) and\nmakes the device not reachable. To recover from this a switch reset is\nrequired.\n\nTo correctly handle this, turn off the cpu ports before changing the\nMAX_FRAME_SIZE and turn on again after the value is applied."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: dsa: qca8k: restablecer el puerto de la CPU al cambiar la MTU Se descubrió que la Documentación carece de un detalle fundamental sobre cómo cambiar correctamente el MAX_FRAME_SIZE del conmutador. De hecho, si se cambia MAX_FRAME_SIZE mientras el puerto de la CPU está encendido, el conmutador entra en pánico y deja de enviar paquetes. Esto hace que el sistema Ethernet de administración no reciba ningún paquete (la recuperación lenta aún funciona) y hace que el dispositivo no sea accesible. Para recuperarse de esto, se requiere un reinicio del conmutador. Para gestionar esto correctamente, apague los puertos de la CPU antes de cambiar MAX_FRAME_SIZE y vuelva a encenderlos después de que se aplique el valor."
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  "lastModified": "2026-06-17T05:18:45.897",
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