ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root

{
  "id": "237d466598cbb4674657fec7c8acc85e6d78995585bf63573c0f8896ebfbdc30",
  "url": "https://osv.dev/vulnerability/CVE-2026-92521",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root acpi_pci_root_add() assigns the freshly allocated root to device->driver_data before dmar_device_add() and pci_acpi_scan_root(). Both failure paths reach the end: label where root is kfree()'d, but only the pci_acpi_scan_root() path clears driver_data first. When dmar_device_add() fails during a hot-add, root is freed while device->driver_data still points at it. The ACPI core does not clear driver_data on attach failure, so a later acpi_pci_find_root() call may dereference this dangling pointer. acpi_pci_root_remove() has the same problem: it frees root without clearing device->driver_data, leaving a dangling pointer behind after the root bridge is removed. Move the NULL assignment to the shared end: label so every error path in acpi_pci_root_add() clears driver_data before freeing root, and clear it in acpi_pci_root_remove() as well, so the object is never left reachable through driver_data after being freed.",
    "evidence": "osv:CVE-2026-92521",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-92521",
      "aliases": [
        "CVE-2026-92521"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                {
                  "fixed": "321bb0eb1486a0d575f02e24e3f4170e408c2f51"
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                {
                  "fixed": "3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2"
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                {
                  "fixed": "a285fa3780c768dcc51c76768707d099a2cc611d"
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                {
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              "type": "ECOSYSTEM",
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                  "introduced": "2.6.28"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:50.028378361Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51",
        "https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2",
        "https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5",
        "https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280",
        "https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217",
        "https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899",
        "https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf",
        "https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92521.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92521",
        "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/2026/92xxx/CVE-2026-92521.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92521",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518580,
  "published_at": "2026-09-17T16:10:28.144+00:00"
}