CVE-2026-92521

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

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 16, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 321bb0eb1486a0d575f02e24e3f4170e408c2f51Affected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2Affected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before a285fa3780c768dcc51c76768707d099a2cc611dAffected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 6aaf6dbf54fdfae096f3f90a79e9614e46579280Affected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 70cf773cca30a10b4964c24520a71279c974b899Affected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 3eee4c21931dc048ce63b86809f04e4e6f0dcad5Affected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217Affected db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 8a742141f7ab84975aa758b775567ef4740ef0cfAffected
LinuxLinux	2.6.28Affected before 2.6.28Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 321bb0eb1486a0d575f02e24e3f4170e408c2f51Affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2Affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before a285fa3780c768dcc51c76768707d099a2cc611dAffected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 6aaf6dbf54fdfae096f3f90a79e9614e46579280Affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 70cf773cca30a10b4964c24520a71279c974b899Affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 3eee4c21931dc048ce63b86809f04e4e6f0dcad5Affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217Affected
db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 to before 8a742141f7ab84975aa758b775567ef4740ef0cfAffected

LinuxLinux

2.6.28Affected
before 2.6.28Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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