CVE-2026-23067 (GCVE-0-2026-23067)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:07 – Updated: 2026-02-09 08:38
VLAI?
Title
iommu/io-pgtable-arm: fix size_t signedness bug in unmap path
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3318f7b5cefbff96b1bb49584ac38d2c9997a830 , < 41ec6988547819756fb65e94fc24f3e0dddf84ac (git)
Affected: 3318f7b5cefbff96b1bb49584ac38d2c9997a830 , < 374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8 (git)
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    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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            "drivers/iommu/io-pgtable-arm.c"
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          "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."
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        "dateUpdated": "2026-02-09T08:38:06.354Z",
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    "dateReserved": "2026-01-13T15:37:45.954Z",
    "dateUpdated": "2026-02-09T08:38:06.354Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23067\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:17.403\",\"lastModified\":\"2026-03-13T21:27:45.107\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-617\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.16\",\"versionEndExcluding\":\"6.18.8\",\"matchCriteriaId\":\"467E1359-7F6A-4790-AC45-172024944460\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/41ec6988547819756fb65e94fc24f3e0dddf84ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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