CVE-2026-92521

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.

CVSS

No CVSS.

References

Link	Resource
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

Configurations

No configuration.

History

17 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:17

Updated : 2026-09-17 17:17

NVD link : CVE-2026-92521

Mitre link : CVE-2026-92521

CVE.ORG link : CVE-2026-92521

JSON object : View

Products Affected

No product.

CWE

No CWE.

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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->driver_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."}], "lastModified": "2026-09-17T17:17:55.013", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}