CVE-2025-68760 (GCVE-0-2025-68760)

Vulnerability from cvelistv5 – Published: 2026-01-05 09:32 – Updated: 2026-01-05 09:32
VLAI?
Title
iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show In iommu_mmio_write(), it validates the user-provided offset with the check: `iommu->dbg_mmio_offset > iommu->mmio_phys_end - 4`. This assumes a 4-byte access. However, the corresponding show handler, iommu_mmio_show(), uses readq() to perform an 8-byte (64-bit) read. If a user provides an offset equal to `mmio_phys_end - 4`, the check passes, and will lead to a 4-byte out-of-bounds read. Fix this by adjusting the boundary check to use sizeof(u64), which corresponds to the size of the readq() operation.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7a4ee419e8c144b747a8915856e91a034d7c8f34 , < b959df804c33913dbfdb90750f2d693502b3d126 (git)
Affected: 7a4ee419e8c144b747a8915856e91a034d7c8f34 , < 0ec4aaf5f3f559716a6559f3d6d9616e9470bed6 (git)
Affected: 7a4ee419e8c144b747a8915856e91a034d7c8f34 , < a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7 (git)
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    Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/debugfs.c"
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                }
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix potential out-of-bounds read in iommu_mmio_show\n\nIn iommu_mmio_write(), it validates the user-provided offset with the\ncheck: `iommu-\u003edbg_mmio_offset \u003e iommu-\u003emmio_phys_end - 4`.\nThis assumes a 4-byte access. However, the corresponding\nshow handler, iommu_mmio_show(), uses readq() to perform an 8-byte\n(64-bit) read.\n\nIf a user provides an offset equal to `mmio_phys_end - 4`, the check\npasses, and will lead to a 4-byte out-of-bounds read.\n\nFix this by adjusting the boundary check to use sizeof(u64), which\ncorresponds to the size of the readq() operation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-05T09:32:32.894Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7"
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      ],
      "title": "iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68760",
    "datePublished": "2026-01-05T09:32:32.894Z",
    "dateReserved": "2025-12-24T10:30:51.033Z",
    "dateUpdated": "2026-01-05T09:32:32.894Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68760\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-05T10:15:57.123\",\"lastModified\":\"2026-01-08T18:09:49.800\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\niommu/amd: Fix potential out-of-bounds read in iommu_mmio_show\\n\\nIn iommu_mmio_write(), it validates the user-provided offset with the\\ncheck: `iommu-\u003edbg_mmio_offset \u003e iommu-\u003emmio_phys_end - 4`.\\nThis assumes a 4-byte access. However, the corresponding\\nshow handler, iommu_mmio_show(), uses readq() to perform an 8-byte\\n(64-bit) read.\\n\\nIf a user provides an offset equal to `mmio_phys_end - 4`, the check\\npasses, and will lead to a 4-byte out-of-bounds read.\\n\\nFix this by adjusting the boundary check to use sizeof(u64), which\\ncorresponds to the size of the readq() operation.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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