mm/hugetlb: fix boot panic with CONFIG_DEBUG_VM and HVO bootmem pages

{
  "id": "18bb83cca60cfde0a52ad14067470e19d88e79afa7c2a7c096c46aa10fb2e1db",
  "url": "https://osv.dev/vulnerability/CVE-2026-93232",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/hugetlb: fix boot panic with CONFIG_DEBUG_VM and HVO bootmem pages",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix boot panic with CONFIG_DEBUG_VM and HVO bootmem pages Patch series \"mm: Refactor bootmem gigantic hugepage allocation\", v4. This series is split out from the earlier larger series \"mm: Generalize HVO for HugeTLB and device DAX\" [1]. It collects the first 19 patches of that series as a standalone set of fixes and preparatory cleanups around bootmem HugeTLB handling, sparse initialization ordering, and related vmemmap setup. The first patches fix a few bugs found while reviewing the existing code, including incorrect bootmem HVO handling, wrong vmemmap registration arguments, a powerpc compound-vmemmap tracking bug, and too-late initialization of gigantic bootmem HugeTLB struct pages. The rest of the series reorders early memory initialization so the relevant zone state is available before sparse and HugeTLB boot-time setup runs, then simplifies the remaining bootmem gigantic hugepage allocation path and removes code made obsolete by that rework. At a high level: - patches [1-4] fix boot-time and arch-specific bugs - patches [5-12] reorder and simplify sparse/mm/hugetlb early init - patches [13-19] refactor bootmem gigantic hugepage allocation and remove obsolete helpers and state This patch (of 19): Commit 622026e87c40 (\"mm/hugetlb: remove fake head pages\") switched HVO to reuse per-zone shared tail pages from zone->vmemmap_tails[]. Those shared tail pages were initialized in hugetlb_vmemmap_in",
    "evidence": "osv:CVE-2026-93232",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-93232",
      "aliases": [
        "CVE-2026-93232"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "622026e87c4019e609010811757e31193cc23847"
                },
                {
                  "fixed": "2ddf429e25cf8415d9c308f07e64012026bd4d77"
                },
                {
                  "fixed": "c0caeceb0c3899dc42844d3979093b27d1434108"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93232.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.1.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93232.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.345827886Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2ddf429e25cf8415d9c308f07e64012026bd4d77",
        "https://git.kernel.org/stable/c/c0caeceb0c3899dc42844d3979093b27d1434108",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93232.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93232",
        "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/2026/93xxx/CVE-2026-93232.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93232",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520036,
  "published_at": "2026-09-24T15:29:22.699+00:00"
}