CVE-2026-80611
Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: processor_idle: Mark LPI enter functions as __cpuidle When function tracing or Kprobes is enabled, entering an ACPI Low Power Idle (LPI) state triggers the following RCU splat: RCU not on for: acpi_idle_lpi_enter+0x4/0xd8 WARNING: CPU: 8 PID: 0 at include/linux/trace_recursion.h:162 function_trace_call+0x1e8/0x228 The acpi_idle_lpi_enter() function is invoked within the cpuidle path after RCU has already been disabled for the current local CPU. Consequently, ftrace's function_trace_call() expects RCU to be actively watching before recording trace data, emitting a warning if it is not. Fix this by annotating acpi_idle_lpi_enter(), the generic __weak stub, and the RISC-V implementation of acpi_processor_ffh_lpi_enter() with __cpuidle. This moves these functions into the '.cpuidle.text' section, implicitly disabling ftrace instrumentation (notrace) along this sensitive path and preventing trace-induced RCU warnings during idle entry.
How to fix
- Linux Linux8ca5dfe4249bbb6bd34f37d16c2ea933c31f6a2a, c17fe25dcb55ab94f6aa2930b7504ea666d5fcc2, 10f675902a5fc88ccfe34bb8aa37de50806b03b1, 5b6165d7ec38477e8cfa41bfa464959957953822, 8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9, 956ca5d72c76504824c8eb601879da9476973e15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | a36a7fecfe6071732075ad5aa31196adce13181b ≤ v < 8ca5dfe4249bbb6bd34f37d16c2ea933c31f6a2a, a36a7fecfe6071732075ad5aa31196adce13181b ≤ v < c17fe25dcb55ab94f6aa2930b7504ea666d5fcc2, a36a7fecfe6071732075ad5aa31196adce13181b ≤ v < 10f675902a5fc88ccfe34bb8aa37de50806b03b1, a36a7fecfe6071732075ad5aa31196adce13181b ≤ v < 5b6165d7ec38477e8cfa41bfa464959957953822, a36a7fecfe6071732075ad5aa31196adce13181b ≤ v < 8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9, a36a7fecfe6071732075ad5aa31196adce13181b ≤ v < 956ca5d72c76504824c8eb601879da9476973e15, 4.8 | 8ca5dfe4249bbb6bd34f37d16c2ea933c31f6a2a, c17fe25dcb55ab94f6aa2930b7504ea666d5fcc2, 10f675902a5fc88ccfe34bb8aa37de50806b03b1, 5b6165d7ec38477e8cfa41bfa464959957953822, 8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9, 956ca5d72c76504824c8eb601879da9476973e15 |
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