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CVE-2025-38413

Estado: ModificadaMedia (5.5)—

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

virtio-net: xsk: rx: fix the frame's length check

When calling buf_to_xdp, the len argument is the frame data's length without virtio header's length (vi->hdr_len). We check that len with

to ensure the provided len does not larger than the allocated chunk size. The additional vi->hdr_len is because in virtnet_add_recvbuf_xsk, we use part of XDP_PACKET_HEADROOM for virtio header and ask the vhost to start placing data from

But the first buffer has virtio_header, so the maximum frame's length in the first buffer can only be

like in the current check.

Leer descripción completaMostrar menos

This commit adds an additional argument to buf_to_xdp differentiate between the first buffer and other ones to correctly calculate the maximum frame's length.

Detalles técnicos trazas, registros y código del informe original
	xsk_pool_get_rx_frame_size() + vi->hdr_len

	hard_start + XDP_PACKET_HEADROOM - vi->hdr_len
not
	hard_start + XDP_PACKET_HEADROOM

	xsk_pool_get_rx_frame_size()
not
	xsk_pool_get_rx_frame_size() + vi->hdr_len

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)

Mostrar
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  "id": "CVE-2025-38413",
  "cveTags": [],
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
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  "published": "2025-07-25T14:15:33.017",
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: xsk: rx: fix the frame's length check\n\nWhen calling buf_to_xdp, the len argument is the frame data's length\nwithout virtio header's length (vi->hdr_len). We check that len with\n\n\txsk_pool_get_rx_frame_size() + vi->hdr_len\n\nto ensure the provided len does not larger than the allocated chunk\nsize. The additional vi->hdr_len is because in virtnet_add_recvbuf_xsk,\nwe use part of XDP_PACKET_HEADROOM for virtio header and ask the vhost\nto start placing data from\n\n\thard_start + XDP_PACKET_HEADROOM - vi->hdr_len\nnot\n\thard_start + XDP_PACKET_HEADROOM\n\nBut the first buffer has virtio_header, so the maximum frame's length in\nthe first buffer can only be\n\n\txsk_pool_get_rx_frame_size()\nnot\n\txsk_pool_get_rx_frame_size() + vi->hdr_len\n\nlike in the current check.\n\nThis commit adds an additional argument to buf_to_xdp differentiate\nbetween the first buffer and other ones to correctly calculate the maximum\nframe's length."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: virtio-net: xsk: rx: corrección de la comprobación de la longitud del marco. Al llamar a buf_to_xdp, el argumento len es la longitud de los datos del marco sin la longitud del encabezado de Virtio (vi->hdr_len). Comprobamos esta longitud con xsk_pool_get_rx_frame_size() + vi->hdr_len para garantizar que la longitud proporcionada no supere el tamaño del fragmento asignado. El valor adicional de vi->hdr_len se debe a que, en virtnet_add_recvbuf_xsk, usamos parte de XDP_PACKET_HEADROOM para el encabezado de virtio y solicitamos al vhost que comience a colocar datos desde hard_start + XDP_PACKET_HEADROOM - vi->hdr_len, no hard_start + XDP_PACKET_HEADROOM. Sin embargo, el primer búfer tiene virtio_header, por lo que la longitud máxima del fotograma en el primer búfer solo puede ser xsk_pool_get_rx_frame_size(), no xsk_pool_get_rx_frame_size() + vi->hdr_len, como en la comprobación actual. Este commit añade un argumento adicional a buf_to_xdp para diferenciar entre el primer búfer y los demás y calcular correctamente la longitud máxima del fotograma."
    }
  ],
  "lastModified": "2026-07-30T06:23:13.000",
  "configurations": [
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