CVE-2026-64512

In CVE-2026-64512, a Linux kernel issue in the ACPI CPPC module stems from field misuse of reg->access_width depending on reg->space_id. When using ACPI_ADR_SPACE_PLATFORM_COMM, access_width indicates the PCC region and can trigger UBSAN shift-out-of-bounds, as illustrated by UBSAN: shift-o...