FKIE_CVE-2026-23067

Vulnerability from fkie_nvd - Published: 2026-02-04 17:16 - Updated: 2026-02-05 14:57
Severity ?
Summary
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 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 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. This matches the behavior of other io-pgtable implementations (io-pgtable-arm-v7s, io-pgtable-dart) which return 0 on error conditions.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41ec6988547819756fb65e94fc24f3e0dddf84ac
Impacted products
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{
  "cveTags": [],
  "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  -\u003e arm_lpae_unmap_pages() returns it\n  -\u003e __iommu_unmap() adds it to iova address\n  -\u003e 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: correcci\u00f3n de error de signo de size_t en la ruta de desmapeo\n\n__arm_lpae_unmap() devuelve size_t pero estaba devolviendo -ENOENT (c\u00f3digo de error negativo) al encontrar una PTE no mapeada. Dado que size_t no tiene signo, -ENOENT (t\u00edpicamente -2) se convierte en un valor positivo enorme (0xFFFFFFFFFFFFFFFE en sistemas de 64 bits).\n\nEste valor corrupto se propaga a trav\u00e9s de la cadena de llamadas:\n  __arm_lpae_unmap() devuelve -ENOENT como size_t\n  -\u0026gt; arm_lpae_unmap_pages() lo devuelve\n  -\u0026gt; __iommu_unmap() lo a\u00f1ade a la direcci\u00f3n iova\n  -\u0026gt; iommu_pgsize() activa BUG_ON debido a iova corrupta\n\nEsto puede causar un desbordamiento de direcci\u00f3n IOVA en el bucle de __iommu_unmap() y activar BUG_ON en iommu_pgsize() por una alineaci\u00f3n de direcci\u00f3n inv\u00e1lida.\n\nSe corrige devolviendo 0 en lugar de -ENOENT. El WARN_ON ya se\u00f1ala la condici\u00f3n de error, y devolver 0 (que significa \u0027nada desmapeado\u0027) es la sem\u00e1ntica 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."
    }
  ],
  "id": "CVE-2026-23067",
  "lastModified": "2026-02-05T14:57:20.563",
  "metrics": {},
  "published": "2026-02-04T17:16:17.403",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/41ec6988547819756fb65e94fc24f3e0dddf84ac"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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