Description
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.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 321bb0eb1486a0d575f02e24e3f4170e408c2f51; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < a285fa3780c768dcc51c76768707d099a2cc611d; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 6aaf6dbf54fdfae096f3f90a79e9614e46579280; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 70cf773cca30a10b4964c24520a71279c974b899; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 3eee4c21931dc048ce63b86809f04e4e6f0dcad5; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217; >= db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 8a742141f7ab84975aa758b775567ef4740ef0cf |
| Linux | Linux | 2.6.28 |
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
Timeline
- Published
- Sep 17, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received