CVE-2026-23067

{"id": "CVE-2026-23067", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "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"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2026-02-04T17:16:17.403", "references": [{"url": "https://git.kernel.org/stable/c/374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/41ec6988547819756fb65e94fc24f3e0dddf84ac", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-617"}]}], "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: 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 -> arm_lpae_unmap_pages() lo devuelve\n -> __iommu_unmap() lo a\u00f1ade a la direcci\u00f3n iova\n -> 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 'nada desmapeado') 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."}], "lastModified": "2026-03-13T21:27:45.107", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "467E1359-7F6A-4790-AC45-172024944460", "versionEndExcluding": "6.18.8", "versionStartIncluding": "6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}