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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/debugfs.c"
          ],
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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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          "url": "https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7"
        }
      ],
      "title": "iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show",
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    }
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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": "2026-05-11T21:52:49.261Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-31",
      "epss": "0.00184",
      "percentile": "0.08036"
    },
    "nvd": {
      "cve": {
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              {
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                "product": "Linux",
                "programFiles": [
                  "drivers/iommu/amd/debugfs.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
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                    "versionType": "git"
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          }
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        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommu/amd: Corrige una posible lectura fuera de l\u00edmites en iommu_mmio_show\n\nEn iommu_mmio_write(), valida el desplazamiento proporcionado por el usuario con la comprobaci\u00f3n: \u0027iommu  -\u003e  dbg_mmio_offset \u003e iommu  -\u003e  mmio_phys_end - 4\u0027.\nEsto asume un acceso de 4 bytes. Sin embargo, el controlador de visualizaci\u00f3n correspondiente, iommu_mmio_show(), usa readq() para realizar una lectura de 8 bytes (64 bits).\n\nSi un usuario proporciona un desplazamiento igual a \u0027mmio_phys_end - 4\u0027, la comprobaci\u00f3n pasa y conducir\u00e1 a una lectura fuera de l\u00edmites de 4 bytes.\n\nSoluciona esto ajustando la comprobaci\u00f3n de l\u00edmites para usar sizeof(u64), lo que corresponde al tama\u00f1o de la operaci\u00f3n readq()."
          }
        ],
        "id": "CVE-2025-68760",
        "lastModified": "2026-10-14T19:10:00.297",
        "metrics": {},
        "published": "2026-01-05T10:15:57.123",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "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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