CVE-2025-38413 (GCVE-0-2025-38413)
Vulnerability from cvelistv5
Published
2025-07-25 13:20
Modified
2025-07-28 04:21
Severity ?
Summary
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 xsk_pool_get_rx_frame_size() + vi->hdr_len 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 hard_start + XDP_PACKET_HEADROOM - vi->hdr_len not hard_start + XDP_PACKET_HEADROOM But the first buffer has virtio_header, so the maximum frame's length in the first buffer can only be xsk_pool_get_rx_frame_size() not xsk_pool_get_rx_frame_size() + vi->hdr_len like in the current check. 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a4e7ba7027012f009f22a68bcfde670f9298d3a4
Version: a4e7ba7027012f009f22a68bcfde670f9298d3a4
Version: a4e7ba7027012f009f22a68bcfde670f9298d3a4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "892f6ed9a4a38bb3360fdff091b9241cfa105b61",
              "status": "affected",
              "version": "a4e7ba7027012f009f22a68bcfde670f9298d3a4",
              "versionType": "git"
            },
            {
              "lessThan": "6013bb6bc24c2cac3f45b37a15b71b232a5b00ff",
              "status": "affected",
              "version": "a4e7ba7027012f009f22a68bcfde670f9298d3a4",
              "versionType": "git"
            },
            {
              "lessThan": "5177373c31318c3c6a190383bfd232e6cf565c36",
              "status": "affected",
              "version": "a4e7ba7027012f009f22a68bcfde670f9298d3a4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/virtio_net.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.37",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.37",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.6",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: xsk: rx: fix the frame\u0027s length check\n\nWhen calling buf_to_xdp, the len argument is the frame data\u0027s length\nwithout virtio header\u0027s length (vi-\u003ehdr_len). We check that len with\n\n\txsk_pool_get_rx_frame_size() + vi-\u003ehdr_len\n\nto ensure the provided len does not larger than the allocated chunk\nsize. The additional vi-\u003ehdr_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-\u003ehdr_len\nnot\n\thard_start + XDP_PACKET_HEADROOM\n\nBut the first buffer has virtio_header, so the maximum frame\u0027s 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-\u003ehdr_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\u0027s length."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:21:26.450Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/892f6ed9a4a38bb3360fdff091b9241cfa105b61"
        },
        {
          "url": "https://git.kernel.org/stable/c/6013bb6bc24c2cac3f45b37a15b71b232a5b00ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/5177373c31318c3c6a190383bfd232e6cf565c36"
        }
      ],
      "title": "virtio-net: xsk: rx: fix the frame\u0027s length check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38413",
    "datePublished": "2025-07-25T13:20:17.394Z",
    "dateReserved": "2025-04-16T04:51:24.013Z",
    "dateUpdated": "2025-07-28T04:21:26.450Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38413\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-25T14:15:33.017\",\"lastModified\":\"2025-07-25T15:29:19.837\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvirtio-net: xsk: rx: fix the frame\u0027s length check\\n\\nWhen calling buf_to_xdp, the len argument is the frame data\u0027s length\\nwithout virtio header\u0027s length (vi-\u003ehdr_len). We check that len with\\n\\n\\txsk_pool_get_rx_frame_size() + vi-\u003ehdr_len\\n\\nto ensure the provided len does not larger than the allocated chunk\\nsize. The additional vi-\u003ehdr_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-\u003ehdr_len\\nnot\\n\\thard_start + XDP_PACKET_HEADROOM\\n\\nBut the first buffer has virtio_header, so the maximum frame\u0027s 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-\u003ehdr_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\u0027s length.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: virtio-net: xsk: rx: correcci\u00f3n de la comprobaci\u00f3n 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-\u0026gt;hdr_len). Comprobamos esta longitud con xsk_pool_get_rx_frame_size() + vi-\u0026gt;hdr_len para garantizar que la longitud proporcionada no supere el tama\u00f1o del fragmento asignado. El valor adicional de vi-\u0026gt;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-\u0026gt;hdr_len, no hard_start + XDP_PACKET_HEADROOM. Sin embargo, el primer b\u00fafer tiene virtio_header, por lo que la longitud m\u00e1xima del fotograma en el primer b\u00fafer solo puede ser xsk_pool_get_rx_frame_size(), no xsk_pool_get_rx_frame_size() + vi-\u0026gt;hdr_len, como en la comprobaci\u00f3n actual. Este commit a\u00f1ade un argumento adicional a buf_to_xdp para diferenciar entre el primer b\u00fafer y los dem\u00e1s y calcular correctamente la longitud m\u00e1xima del fotograma.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5177373c31318c3c6a190383bfd232e6cf565c36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6013bb6bc24c2cac3f45b37a15b71b232a5b00ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/892f6ed9a4a38bb3360fdff091b9241cfa105b61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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