CVE-2026-92521 (GCVE-0-2026-92521)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-19 09:04
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
Version: db89b4f0dbab837d0f3de2c3e9427a8d5393afa3
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/pci_root.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.28"
            },
            {
              "lessThan": "2.6.28",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.18.*",
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              "version": "7.2.6",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root\n\nacpi_pci_root_add() assigns the freshly allocated root to\ndevice-\u003edriver_data before dmar_device_add() and pci_acpi_scan_root().\nBoth failure paths reach the end: label where root is kfree()\u0027d, but\nonly the pci_acpi_scan_root() path clears driver_data first.\n\nWhen dmar_device_add() fails during a hot-add, root is freed while\ndevice-\u003edriver_data still points at it.  The ACPI core does not clear\ndriver_data on attach failure, so a later acpi_pci_find_root() call may\ndereference this dangling pointer.\n\nacpi_pci_root_remove() has the same problem: it frees root without\nclearing device-\u003edriver_data, leaving a dangling pointer behind after\nthe root bridge is removed.\n\nMove the NULL assignment to the shared end: label so every error path in\nacpi_pci_root_add() clears driver_data before freeing root, and clear it\nin acpi_pci_root_remove() as well, so the object is never left reachable\nthrough driver_data after being freed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:04:27.575Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280"
        },
        {
          "url": "https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899"
        },
        {
          "url": "https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf"
        }
      ],
      "title": "ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92521",
    "datePublished": "2026-09-17T16:10:28.144Z",
    "dateReserved": "2026-09-16T12:21:13.874Z",
    "dateUpdated": "2026-10-19T09:04:27.575Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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