CVE-2026-64227

Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: driver: Check ACPI_COMPANION() against NULL during probe Since every platform driver can be forced to match a device that doesn-t match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device-s ACPI companion object should verify its presence. Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices. Also change the value returned by the ACPI thermal zone driver when the device-s ACPI companion is not present to -ENODEV for consistency with the other drivers.