KVM: arm64: Check the untrusted offset in FF-A memory share

{
  "id": "d9557a851f9fe5be2e30c85a39fb2ac6c1d362689ce37c0a9dd4c295066eba7f",
  "url": "https://osv.dev/vulnerability/CVE-2025-40266",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "KVM: arm64: Check the untrusted offset in FF-A memory share",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Check the untrusted offset in FF-A memory share Verify the offset to prevent OOB access in the hypervisor FF-A buffer in case an untrusted large enough value [U32_MAX - sizeof(struct ffa_composite_mem_region) + 1, U32_MAX] is set from the host kernel.",
    "evidence": "osv:CVE-2025-40266",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.118",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.60",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-40266",
      "aliases": [
        "A-439862698",
        "ASB-A-439862698",
        "CVE-2025-40266"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6211753fdfd05af9e08f54c8d0ba3ee516034878"
                },
                {
                  "fixed": "fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041"
                },
                {
                  "fixed": "bc1909ef38788f2ee3d8011d70bf029948433051"
                },
                {
                  "fixed": "f9f1aed6c8a3427900da3121e1868124854569c3"
                },
                {
                  "fixed": "103e17aac09cdd358133f9e00998b75d6c1f1518"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40266.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.11.0"
                },
                {
                  "fixed": "6.6.118"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.60"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40266.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.231039249Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/103e17aac09cdd358133f9e00998b75d6c1f1518",
        "https://git.kernel.org/stable/c/bc1909ef38788f2ee3d8011d70bf029948433051",
        "https://git.kernel.org/stable/c/f9f1aed6c8a3427900da3121e1868124854569c3",
        "https://git.kernel.org/stable/c/fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a1041",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40266.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40266",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40266.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40266",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513378,
  "published_at": "2025-12-04T16:08:25.392+00:00"
}