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CVE-2026-93785

Estado: RecibidaSin puntuar—

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

cifs: validate idmap key payload length

The cifs.idmap key type stores its payload length in key->datalen, which is limited to U16_MAX. Accepting a larger key payload truncates the recorded length and can make later users interpret the payload using inconsistent bounds.

Reject oversized preparsed payloads before allocating or copying them. This keeps key->datalen consistent with the stored data for both inline and separately allocated idmap payloads.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-93785",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "eeac976b74b4f697cfc517187b7cbfd72652dbbc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "125b05ac8ca8758950e4369c1542d57a162f504c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "945f6cde6bcf8f08f6fa5df8882b1b9582e55efa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "3a4a34a732e8a08309eed0a74314dbd9f2f1c972",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "6cfeef221ac00d63c07f6122f58e6159bde69ca0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "8b12f65d7caf16d124098cb4895a203367d35b57",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
              "lessThan": "455488cd5054bcc59db40fa1cc2c004031a5b2a5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/smb/client/cifsacl.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/smb/client/cifsacl.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:11.130",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/125b05ac8ca8758950e4369c1542d57a162f504c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3a4a34a732e8a08309eed0a74314dbd9f2f1c972",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/945f6cde6bcf8f08f6fa5df8882b1b9582e55efa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/eeac976b74b4f697cfc517187b7cbfd72652dbbc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: validate idmap key payload length\n\nThe cifs.idmap key type stores its payload length in key->datalen, which\nis limited to U16_MAX.  Accepting a larger key payload truncates the\nrecorded length and can make later users interpret the payload using\ninconsistent bounds.\n\nReject oversized preparsed payloads before allocating or copying them.\nThis keeps key->datalen consistent with the stored data for both inline\nand separately allocated idmap payloads."
    }
  ],
  "lastModified": "2026-10-03T11:17:48.050",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}