ovl: don't allow datadir only

{
  "id": "40a1b071cd04abf41a4ab944e265a706f72562bc956ec6ba9fe04374826479c9",
  "url": "https://osv.dev/vulnerability/CVE-2025-37863",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ovl: don't allow datadir only",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ovl: don't allow datadir only In theory overlayfs could support upper layer directly referring to a data layer, but there's no current use case for this. Originally, when data-only layers were introduced, this wasn't allowed, only introduced by the \"datadir+\" feature, but without actually handling this case, resulting in an Oops. Fix by disallowing datadir without lowerdir.",
    "evidence": "osv:CVE-2025-37863",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.88",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.25",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-37863",
      "aliases": [
        "CVE-2025-37863"
      ],
      "affected": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37863.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "0"
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              "type": "ECOSYSTEM",
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37863.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.239752046Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0874b629f65320778e7e3e206177770666d9db18",
        "https://git.kernel.org/stable/c/21d2ffb0e9838a175064c22f3a9de97d1f56f27d",
        "https://git.kernel.org/stable/c/b9e3579213ba648fa23f780e8d53e99011c62331",
        "https://git.kernel.org/stable/c/eb3a04a8516ee9b5174379306f94279fc90424c4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37863.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-37863",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37863.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-37863",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503157,
  "published_at": "2025-05-09T06:43:54.25+00:00"
}