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CVE-2025-37863

Status: AnalyzedMedium (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

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Linux — Linux Kernel

CWEs

References

Raw JSON (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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  "published": "2025-05-09T07:16:07.317",
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      "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": [
    {
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