CVE-2025-39699 (GCVE-0-2025-39699)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-05-11 21:34
VLAI
Title
iommu/riscv: prevent NULL deref in iova_to_phys
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/riscv: prevent NULL deref in iova_to_phys The riscv_iommu_pte_fetch() function returns either NULL for unmapped/never-mapped iova, or a valid leaf pte pointer that requires no further validation. riscv_iommu_iova_to_phys() failed to handle NULL returns. Prevent null pointer dereference in riscv_iommu_iova_to_phys(), and remove the pte validation.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 488ffbf181718b9ad8c1838cb249d60973e78eda , < 220c491490255b656672bb572b18460cd9155926 (git)
Affected: 488ffbf181718b9ad8c1838cb249d60973e78eda , < 99d4d1a070870aa08163af8ce0522992b7f35d8c (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:34:33.067Z",
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    "cveId": "CVE-2025-39699",
    "datePublished": "2025-09-05T17:21:05.379Z",
    "dateReserved": "2025-04-16T07:20:57.115Z",
    "dateUpdated": "2026-05-11T21:34:33.067Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/riscv: prevent NULL deref in iova_to_phys\n\nThe riscv_iommu_pte_fetch() function returns either NULL for\nunmapped/never-mapped iova, or a valid leaf pte pointer that\nrequires no further validation.\n\nriscv_iommu_iova_to_phys() failed to handle NULL returns.\nPrevent null pointer dereference in\nriscv_iommu_iova_to_phys(), and remove the pte validation."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\niommu/riscv: evitar desreferencia NULL en iova_to_phys\n\nLa funci\u00f3n riscv_iommu_pte_fetch() devuelve NULL para iova no mapeada/nunca mapeada, o un puntero pte de hoja v\u00e1lido que no requiere validaci\u00f3n adicional.\n\nriscv_iommu_iova_to_phys() no pudo manejar los retornos NULL.\nEvitar la desreferencia de puntero nulo en riscv_iommu_iova_to_phys(), y eliminar la validaci\u00f3n de pte."
          }
        ],
        "id": "CVE-2025-39699",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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                "value": "CWE-476"
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      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:24:52+00:00",
      "cve": "CVE-2025-39699",
      "id": "CVE-2025-39699",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: iommu/riscv: prevent NULL deref in iova_to_phys",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39699.json",
      "version": "3"
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}



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