CVE-2025-40065 (GCVE-0-2025-40065)

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-10-21 12:37
VLAI
Title
RISC-V: KVM: Write hgatp register with valid mode bits
Summary
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Write hgatp register with valid mode bits According to the RISC-V Privileged Architecture Spec, when MODE=Bare is selected,software must write zero to the remaining fields of hgatp. We have detected the valid mode supported by the HW before, So using a valid mode to detect how many vmid bits are supported.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fd7bb4a251dfc1da3496bf59a4793937c13e8c1f , < 8b6e327736db013b9e385c3f6f9f0b04ddf26e43 (git)
Affected: fd7bb4a251dfc1da3496bf59a4793937c13e8c1f , < 5cba8ae00279296a586d0596443109d601b1d116 (git)
Affected: fd7bb4a251dfc1da3496bf59a4793937c13e8c1f , < d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357 (git)
Affected: fd7bb4a251dfc1da3496bf59a4793937c13e8c1f , < 2b351e3d04be9e1533f26c3464f1e44a5beace30 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kvm/vmid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "5cba8ae00279296a586d0596443109d601b1d116",
              "status": "affected",
              "version": "fd7bb4a251dfc1da3496bf59a4793937c13e8c1f",
              "versionType": "git"
            },
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              "versionType": "git"
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              "versionType": "git"
            }
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Write hgatp register with valid mode bits\n\nAccording to the RISC-V Privileged Architecture Spec, when MODE=Bare\nis selected,software must write zero to the remaining fields of hgatp.\n\nWe have detected the valid mode supported by the HW before, So using a\nvalid mode to detect how many vmid bits are supported."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:37:44.298Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8b6e327736db013b9e385c3f6f9f0b04ddf26e43"
        },
        {
          "url": "https://git.kernel.org/stable/c/5cba8ae00279296a586d0596443109d601b1d116"
        },
        {
          "url": "https://git.kernel.org/stable/c/d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b351e3d04be9e1533f26c3464f1e44a5beace30"
        }
      ],
      "title": "RISC-V: KVM: Write hgatp register with valid mode bits",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40065",
    "datePublished": "2025-10-28T11:48:35.785Z",
    "dateReserved": "2025-04-16T07:20:57.159Z",
    "dateUpdated": "2026-10-21T12:37:44.298Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40065",
      "date": "2026-10-27",
      "epss": "0.00238",
      "percentile": "0.14725"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-24T02:43:10.000Z",
      "cve": "CVE-2025-40065",
      "id": "msrc_CVE-2025-40065",
      "initial_release_date": "2025-10-29T01:04:39.000Z",
      "product_status:known_affected": "19",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RISC-V: KVM: Write hgatp register with valid mode bits",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40065.json",
      "version": "20"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/riscv/kvm/vmid.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "8b6e327736db013b9e385c3f6f9f0b04ddf26e43",
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                    "status": "affected",
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              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "arch/riscv/kvm/vmid.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.16"
                  },
                  {
                    "lessThan": "5.16",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
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                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.160",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.114",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
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                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Write hgatp register with valid mode bits\n\nAccording to the RISC-V Privileged Architecture Spec, when MODE=Bare\nis selected,software must write zero to the remaining fields of hgatp.\n\nWe have detected the valid mode supported by the HW before, So using a\nvalid mode to detect how many vmid bits are supported."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nRISC-V: KVM: Escribir el registro hgatp con bits de modo v\u00e1lidos\n\nSeg\u00fan la Especificaci\u00f3n de Arquitectura Privilegiada de RISC-V, cuando se selecciona MODE=Bare, el software debe escribir cero en los campos restantes de hgatp.\n\nHemos detectado previamente el modo v\u00e1lido soportado por el hardware, por lo tanto, usando un modo v\u00e1lido para detectar cu\u00e1ntos bits vmid son soportados."
          }
        ],
        "id": "CVE-2025-40065",
        "lastModified": "2026-10-21T13:18:18.500",
        "metrics": {},
        "published": "2025-10-28T12:15:40.950",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:15:25+00:00",
      "cve": "CVE-2025-40065",
      "id": "CVE-2025-40065",
      "initial_release_date": "2025-10-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RISC-V: KVM: Write hgatp register with valid mode bits",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40065.json",
      "version": "3"
    }
  }
}



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