CVE-2026-80611

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/10f675902a5fc88ccfe34bb8aa37de50806b03b1
https://git.kernel.org/stable/c/5b6165d7ec38477e8cfa41bfa464959957953822
https://git.kernel.org/stable/c/8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9
https://git.kernel.org/stable/c/956ca5d72c76504824c8eb601879da9476973e15

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-28 08:16

Updated : 2026-08-28 08:16

NVD link : CVE-2026-80611

Mitre link : CVE-2026-80611

CVE.ORG link : CVE-2026-80611

JSON object : View

Products Affected

No product.

CWE

No CWE.

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