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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          "product": "Linux",
          "programFiles": [
            "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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      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:38:06.354Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/41ec6988547819756fb65e94fc24f3e0dddf84ac"
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          "url": "https://git.kernel.org/stable/c/374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8"
        }
      ],
      "title": "iommu/io-pgtable-arm: fix size_t signedness bug in unmap path",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23067",
    "datePublished": "2026-02-04T16:07:48.457Z",
    "dateReserved": "2026-01-13T15:37:45.954Z",
    "dateUpdated": "2026-02-09T08:38:06.354Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23067\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:17.403\",\"lastModified\":\"2026-02-05T14:57:20.563\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/374e7af67d9d9d6103c2cfc8eb32abfecf3a2fd8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41ec6988547819756fb65e94fc24f3e0dddf84ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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