CVE-2026-93251

ACPI: bus: Introduce acpi_bus_get_primary_device()

State: Published
Severity: Not scored
Published: Sep 24, 2026
Updated: Oct 30, 2026
Reserved: Sep 17, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

ACPI: bus: Introduce acpi_bus_get_primary_device()

The function used for obtaining the first "physical" device for which the given ACPI one is the ACPI companion, acpi_get_first_physical_node(), may return a stale device pointer (mostly in theory) because acpi_unbind_one() may run as a whole after dropping the ACPI device's physical_node_lock in acpi_get_first_physical_node() and before it returns. The last reference to the "physical" device may be dropped then before the pointer to it is returned to the caller.

If that happens and the acpi_get_first_physical_node() caller invokes get_device() on the pointer obtained from it, which is done by the majority of its callers, a use-after-free will occur.

To prepare for addressing this problem, introduce a new function for getting the first "physical" device associated with the given ACPI one (the "primary physical device") that will also reference count the device in question before returning a pointer to it.

Make that new function and acpi_get_first_physical_node() share the physical node list lookup code.

No intentional functional impact.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	91e5687805885f9fceb60b95e950a3d3bdcf4764 to before f912f88126e385f6cfcd1a28de73afb7d3943c8dAffected 91e5687805885f9fceb60b95e950a3d3bdcf4764 to before 50ddd82b88b1d1cc467b5df953344c1a9feec268Affected 91e5687805885f9fceb60b95e950a3d3bdcf4764 to before fd4f907b558721716da30acd6630191acf811b95Affected 91e5687805885f9fceb60b95e950a3d3bdcf4764 to before ebdd932dc24c1cf7cc31710b7730515e4e66d886Affected 91e5687805885f9fceb60b95e950a3d3bdcf4764 to before 5657859851abb65105220a6cdb5804926249f714Affected 91e5687805885f9fceb60b95e950a3d3bdcf4764 to before 72530e1f72b0515a73fd88292254d04fecf03649Affected
LinuxLinux	3.8Affected before 3.8Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.57 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

91e5687805885f9fceb60b95e950a3d3bdcf4764 to before f912f88126e385f6cfcd1a28de73afb7d3943c8dAffected
91e5687805885f9fceb60b95e950a3d3bdcf4764 to before 50ddd82b88b1d1cc467b5df953344c1a9feec268Affected
91e5687805885f9fceb60b95e950a3d3bdcf4764 to before fd4f907b558721716da30acd6630191acf811b95Affected
91e5687805885f9fceb60b95e950a3d3bdcf4764 to before ebdd932dc24c1cf7cc31710b7730515e4e66d886Affected
91e5687805885f9fceb60b95e950a3d3bdcf4764 to before 5657859851abb65105220a6cdb5804926249f714Affected
91e5687805885f9fceb60b95e950a3d3bdcf4764 to before 72530e1f72b0515a73fd88292254d04fecf03649Affected

LinuxLinux

3.8Affected
before 3.8Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.57 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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