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CVE-2025-37863

Estado: AnalizadaMedia (5.5)—

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.

CVSS

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-37863",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
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          "product": "Linux",
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              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
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          ],
          "programFiles": [
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  ],
  "published": "2025-05-09T07:16:07.317",
  "references": [
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      "url": "https://git.kernel.org/stable/c/0874b629f65320778e7e3e206177770666d9db18",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/21d2ffb0e9838a175064c22f3a9de97d1f56f27d",
      "tags": [
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: don't allow datadir only\n\nIn theory overlayfs could support upper layer directly referring to a data\nlayer, but there's no current use case for this.\n\nOriginally, when data-only layers were introduced, this wasn't allowed,\nonly introduced by the \"datadir+\" feature, but without actually handling\nthis case, resulting in an Oops.\n\nFix by disallowing datadir without lowerdir."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ovl: no se permite solo datadir. En teoría, overlayfs podría permitir que la capa superior haga referencia directa a una capa de datos, pero actualmente no existe un caso práctico para esto. Originalmente, cuando se introdujeron las capas de solo datos, esto no se permitía; solo se introdujo mediante la función \"datadir+\", pero sin gestionar este caso, lo que resultaba en un error. Se soluciona deshabilitando datadir sin lowerdir."
    }
  ],
  "lastModified": "2026-06-17T09:15:35.453",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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}