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

Vulnerability from cvelistv5 – Published: 2026-01-05 09:32 – Updated: 2026-05-11 21:52
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 CPE status
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 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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              "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": "2026-05-11T21:52:49.261Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7"
        }
      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68760",
    "datePublished": "2026-01-05T09:32:32.894Z",
    "dateReserved": "2025-12-24T10:30:51.033Z",
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    "state": "PUBLISHED"
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          }
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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."
          }
        ],
        "id": "CVE-2025-68760",
        "lastModified": "2026-06-17T09:59:32.580",
        "metrics": {},
        "published": "2026-01-05T10:15:57.123",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "current_release_date": "2026-06-30T10:23:16+00:00",
      "cve": "CVE-2025-68760",
      "id": "CVE-2025-68760",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68760.json",
      "version": "3"
    }
  }
}



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