CVE-2025-40046

{
  "id": "CVE-2025-40046",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-10-28T12:15:38.687",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/zcrx: fix overshooting recv limit\n\nIt's reported that sometimes a zcrx request can receive more than was\nrequested. It's caused by io_zcrx_recv_skb() adjusting desc->count for\nall received buffers including frag lists, but then doing recursive\ncalls to process frag list skbs, which leads to desc->count double\naccounting and underflow."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio_uring/zcrx: corregir el exceso del límite de recepción\n\nSe informa que a veces una solicitud zcrx puede recibir más de lo solicitado. Es causado por io_zcrx_recv_skb() ajustando desc->count para todos los búferes recibidos, incluyendo listas de fragmentos, pero luego realizando llamadas recursivas para procesar los skbs de la lista de fragmentos, lo que lleva a una doble contabilidad y desbordamiento negativo de desc->count."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "io_uring/zcrx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6699ec9a23f85f1764183430209c741847c45f12",
              "lessThan": "8bcc9eaf1b19f1a7029cba19f6bd4122b40f6c4f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6699ec9a23f85f1764183430209c741847c45f12",
              "lessThan": "09cfd3c52ea76f43b3cb15e570aeddf633d65e80",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "io_uring/zcrx.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.15",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.17.3",
              "lessThanOrEqual": "6.17.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.7
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/09cfd3c52ea76f43b3cb15e570aeddf633d65e80",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8bcc9eaf1b19f1a7029cba19f6bd4122b40f6c4f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}