FKIE_CVE-2025-68760

Vulnerability from fkie_nvd - Published: 2026-01-05 10:15 - Updated: 2026-10-14 19:10
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ec4aaf5f3f559716a6559f3d6d9616e9470bed6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/debugfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b959df804c33913dbfdb90750f2d693502b3d126",
              "status": "affected",
              "version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
              "versionType": "git"
            },
            {
              "lessThan": "0ec4aaf5f3f559716a6559f3d6d9616e9470bed6",
              "status": "affected",
              "version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
              "versionType": "git"
            },
            {
              "lessThan": "a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7",
              "status": "affected",
              "version": "7a4ee419e8c144b747a8915856e91a034d7c8f34",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/debugfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b959df804c33913dbfdb90750f2d693502b3d126"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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