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CVE-2026-23067

Estado: AnalizadaMedia (5.5)—

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

iommu/io-pgtable-arm: fix size_t signedness bug in unmap path

__arm_lpae_unmap() returns size_t but was returning -ENOENT (negative error code) when encountering an unmapped PTE. Since size_t is unsigned, -ENOENT (typically -2) becomes a huge positive value (0xFFFFFFFFFFFFFFFE on 64-bit systems).

This can cause IOVA address overflow in __iommu_unmap() loop and trigger BUG_ON in iommu_pgsize() from invalid address alignment.

Fix by returning 0 instead of -ENOENT. The WARN_ON already signals the error condition, and returning 0 (meaning "nothing unmapped") is the correct semantic for size_t return type.

Leer descripción completaMostrar menos

This matches the behavior of other io-pgtable implementations (io-pgtable-arm-v7s, io-pgtable-dart) which return 0 on error conditions.

Detalles técnicos trazas, registros y código del informe original
This corrupted value propagates through the call chain:
  __arm_lpae_unmap() returns -ENOENT as size_t
  -> arm_lpae_unmap_pages() returns it
  -> __iommu_unmap() adds it to iova address
  -> iommu_pgsize() triggers BUG_ON due to corrupted iova

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-2026-23067",
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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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        "exploitabilityScore": 1.8
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  "published": "2026-02-04T17:16:17.403",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-617"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/io-pgtable-arm: fix size_t signedness bug in unmap path\n\n__arm_lpae_unmap() returns size_t but was returning -ENOENT (negative\nerror code) when encountering an unmapped PTE. Since size_t is unsigned,\n-ENOENT (typically -2) becomes a huge positive value (0xFFFFFFFFFFFFFFFE\non 64-bit systems).\n\nThis corrupted value propagates through the call chain:\n  __arm_lpae_unmap() returns -ENOENT as size_t\n  -> arm_lpae_unmap_pages() returns it\n  -> __iommu_unmap() adds it to iova address\n  -> iommu_pgsize() triggers BUG_ON due to corrupted iova\n\nThis can cause IOVA address overflow in __iommu_unmap() loop and\ntrigger BUG_ON in iommu_pgsize() from invalid address alignment.\n\nFix by returning 0 instead of -ENOENT. The WARN_ON already signals\nthe error condition, and returning 0 (meaning \"nothing unmapped\")\nis the correct semantic for size_t return type. This matches the\nbehavior of other io-pgtable implementations (io-pgtable-arm-v7s,\nio-pgtable-dart) which return 0 on error conditions."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommu/io-pgtable-arm: corrección de error de signo de size_t en la ruta de desmapeo\n\n__arm_lpae_unmap() devuelve size_t pero estaba devolviendo -ENOENT (código de error negativo) al encontrar una PTE no mapeada. Dado que size_t no tiene signo, -ENOENT (típicamente -2) se convierte en un valor positivo enorme (0xFFFFFFFFFFFFFFFE en sistemas de 64 bits).\n\nEste valor corrupto se propaga a través de la cadena de llamadas:\n  __arm_lpae_unmap() devuelve -ENOENT como size_t\n  -> arm_lpae_unmap_pages() lo devuelve\n  -> __iommu_unmap() lo añade a la dirección iova\n  -> iommu_pgsize() activa BUG_ON debido a iova corrupta\n\nEsto puede causar un desbordamiento de dirección IOVA en el bucle de __iommu_unmap() y activar BUG_ON en iommu_pgsize() por una alineación de dirección inválida.\n\nSe corrige devolviendo 0 en lugar de -ENOENT. El WARN_ON ya señala la condición de error, y devolver 0 (que significa 'nada desmapeado') es la semántica correcta para el tipo de retorno size_t. Esto coincide con el comportamiento de otras implementaciones de io-pgtable (io-pgtable-arm-v7s, io-pgtable-dart) que devuelven 0 en condiciones de error."
    }
  ],
  "lastModified": "2026-06-17T10:20:48.273",
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