Linux Kernel EUVD-2026-38887

The affected code resides in the Linux kernel's clock subsystem (drivers/clk/spacemit/ccu_mix.c), which manages clock frequency changes for SpaceMIT's K1 RISC-V SoC. The ccu_mix_trigger_fc() function is responsible for issuing a frequency change (FC) trigger to the hardware clock control unit (CCU). Due to an inverted condition (!condition instead of condition), the trigger fires when it should be suppressed and is suppressed when it should fire, corrupting hardware clock state and causing kernel panics whenever the cpufreq subsystem (e.g., a frequency governor like schedutil or ondemand) attempts to scale the CPU clock. The CWE is not formally assigned in the input data, but the root cause class is CWE-570 (Expression is Always False) or CWE-571 (Expression is Always True). CPE data (cpe:2.3:a:linux:linux) confirms this as an upstream Linux kernel issue.