mm: turn folio_test_hugetlb into a PageType

{
  "id": "d7cb31f2882312fef763d699e39426b8a79d974c83b1735c382bd95c67a4f118",
  "url": "https://osv.dev/vulnerability/CVE-2024-35993",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm: turn folio_test_hugetlb into a PageType",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm: turn folio_test_hugetlb into a PageType The current folio_test_hugetlb() can be fooled by a concurrent folio split into returning true for a folio which has never belonged to hugetlbfs. This can't happen if the caller holds a refcount on it, but we have a few places (memory-failure, compaction, procfs) which do not and should not take a speculative reference. Since hugetlb pages do not use individual page mapcounts (they are always fully mapped and use the entire_mapcount field to record the number of mappings), the PageType field is available now that page_mapcount() ignores the value in this field. In compaction and with CONFIG_DEBUG_VM enabled, the current implementation can result in an oops, as reported by Luis. This happens since 9c5ccf2db04b (\"mm: remove HUGETLB_PAGE_DTOR\") effectively added some VM_BUG_ON() checks in the PageHuge() testing path. [willy@infradead.org: update vmcoreinfo]",
    "evidence": "osv:CVE-2024-35993",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.30",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.8.9",
            "evidence": "/affected/1/ranges"
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    "severity": "high",
    "structured": {
      "id": "CVE-2024-35993",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.6.0"
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                {
                  "fixed": "6.6.30"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.7.0"
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      "modified": "2026-10-28T02:30:33.522095110Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2431b5f2650dfc47ce782d1ca7b02d6b3916976f",
        "https://git.kernel.org/stable/c/9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32",
        "https://git.kernel.org/stable/c/d99e3140a4d33e26066183ff727d8f02f56bec64",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35993.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-35993",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 500271,
  "published_at": "2024-05-20T09:47:57.739+00:00"
}