mshv: Fix create memory region overlap check

{
  "id": "8dae22ab9e95f9777385e26ba9a01854775ec3309134d7d1d0a32347a15958e5",
  "url": "https://osv.dev/vulnerability/CVE-2025-68743",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mshv: Fix create memory region overlap check",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mshv: Fix create memory region overlap check The current check is incorrect; it only checks if the beginning or end of a region is within an existing region. This doesn't account for userspace specifying a region that begins before and ends after an existing region. Change the logic to a range intersection check against gfns and uaddrs for each region. Remove mshv_partition_region_by_uaddr() as it is no longer used.",
    "evidence": "osv:CVE-2025-68743",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.17.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-68743",
      "aliases": [
        "CVE-2025-68743"
      ],
      "affected": [
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          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "2183924dd834e0703f87e17c17e689bcbf55d69d"
                },
                {
                  "fixed": "ab3e7a78d83a61d335458cfe2e4d17eba69ae73d"
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                {
                  "fixed": "ba9eb9b86d232854e983203dc2fb1ba18e316681"
                }
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68743.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
                },
                {
                  "fixed": "6.17.13"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
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                {
                  "fixed": "6.18.2"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68743.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.328073752Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2183924dd834e0703f87e17c17e689bcbf55d69d",
        "https://git.kernel.org/stable/c/ab3e7a78d83a61d335458cfe2e4d17eba69ae73d",
        "https://git.kernel.org/stable/c/ba9eb9b86d232854e983203dc2fb1ba18e316681",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68743.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68743",
        "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/2025/68xxx/CVE-2025-68743.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-68743",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505477,
  "published_at": "2025-12-24T12:09:40.148+00:00"
}