CVE-2026-93785 (GCVE-0-2026-93785)
Vulnerability from cvelistv5
Published
2026-09-24 16:02
Modified
2026-10-03 10:57
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
Version: 21fed0d5b763b94a7d1568c27d0cce892ab8d43e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/cifsacl.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.2"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "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-\u003edatalen, 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-\u003edatalen consistent with the stored data for both inline\nand separately allocated idmap payloads."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:57:20.267Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eeac976b74b4f697cfc517187b7cbfd72652dbbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/125b05ac8ca8758950e4369c1542d57a162f504c"
        },
        {
          "url": "https://git.kernel.org/stable/c/945f6cde6bcf8f08f6fa5df8882b1b9582e55efa"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a4a34a732e8a08309eed0a74314dbd9f2f1c972"
        },
        {
          "url": "https://git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57"
        },
        {
          "url": "https://git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5"
        }
      ],
      "title": "cifs: validate idmap key payload length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93785",
    "datePublished": "2026-09-24T16:02:18.964Z",
    "dateReserved": "2026-09-18T17:59:28.788Z",
    "dateUpdated": "2026-10-03T10:57:20.267Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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