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CVE-2026-100072: ACPI: platform: Use acpi_bus_get_primary_device()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-21
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: platform: Use acpi_bus_get_primary_device() The acpi_get_first_physical_node() usage in acpi_platform_fill_resource() and acpi_create_platform_device() is generally unsafe because in theory the device returned by it may be freed at any time [1]. It is also inefficient because acpi_get_first_physical_node() is called multiple times for the same argument which can be avoided. Address these issues by using acpi_bus_get_primary_device() instead of acpi_get_first_physical_node() and adjusting the code to call it just once at the beginning of and acpi_create_platform_device() and drop the device reference acquired by it upon the return from that function.

Affected products

• Linux kernel: from 4.6 before 7.2.6 — fixed in 7.2.6

How to fix

Upgrade to a fixed version: Linux kernel 7.2.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/527a497fb2ef77a95170eefe2007e2c4c957bd2c
• https://git.kernel.org/stable/c/a75e5de593ef158feb17989bff7730c5a3d82503
• https://git.kernel.org/stable/c/a9ba4dd2f18bf3f439d9ef0d8f375f90360ba1bd
• https://git.kernel.org/stable/c/c9d202d3b6c28e8c779cd2f2b10d2f7ab665ca71

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