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CVE-2024-49974

Estado: ModificadaMedia (5.5)—

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

NFSD: Limit the number of concurrent async COPY operations

Nothing appears to limit the number of concurrent async COPY operations that clients can start. In addition, AFAICT each async COPY can copy an unlimited number of 4MB chunks, so can run for a long time. Thus IMO async COPY can become a DoS vector.

Add a restriction mechanism that bounds the number of concurrent background COPY operations. Start simple and try to be fair -- this patch implements a per-namespace limit.

An async COPY request that occurs while this limit is exceeded gets NFS4ERR_DELAY. The requesting client can choose to send the request again after a delay or fall back to a traditional read/write style copy.

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If there is need to make the mechanism more sophisticated, we can visit that in future patches.

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\nNFSD: Limit the number of concurrent async COPY operations\n\nNothing appears to limit the number of concurrent async COPY\noperations that clients can start. In addition, AFAICT each async\nCOPY can copy an unlimited number of 4MB chunks, so can run for a\nlong time. Thus IMO async COPY can become a DoS vector.\n\nAdd a restriction mechanism that bounds the number of concurrent\nbackground COPY operations. Start simple and try to be fair -- this\npatch implements a per-namespace limit.\n\nAn async COPY request that occurs while this limit is exceeded gets\nNFS4ERR_DELAY. The requesting client can choose to send the request\nagain after a delay or fall back to a traditional read/write style\ncopy.\n\nIf there is need to make the mechanism more sophisticated, we can\nvisit that in future patches."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSD: Limitar el número de operaciones de COPIA asíncronas concurrentes No parece que nada limite el número de operaciones de COPIA asíncronas concurrentes que los clientes pueden iniciar. Además, según tengo entendido, cada COPIA asíncrona puede copiar una cantidad ilimitada de fragmentos de 4 MB, por lo que puede ejecutarse durante mucho tiempo. Por lo tanto, en mi opinión, la COPIA asíncrona puede convertirse en un vector de denegación de servicio (DoS). Agregue un mecanismo de restricción que limite el número de operaciones de COPIA en segundo plano concurrentes. Comience de manera simple e intente ser justo: este parche implementa un límite por espacio de nombres. Una solicitud de COPIA asíncrona que se produce mientras se excede este límite obtiene NFS4ERR_DELAY. El cliente solicitante puede elegir enviar la solicitud nuevamente después de un retraso o volver a una copia de estilo de lectura/escritura tradicional. Si es necesario hacer que el mecanismo sea más sofisticado, podemos tratarlo en parches futuros."
    }
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