ACPI: processor_idle: Mark LPI enter functions as __cpuidle

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80611
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:45 UTC
Updated2026-08-28 08:16:45 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.062820000 (date 2026-08-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a36a7fecfe6071732075ad5aa31196adce13181b 10f675902a5fc88ccfe34bb8aa37de50806b03b1 git Not specified
CNA Linux Linux affected a36a7fecfe6071732075ad5aa31196adce13181b 5b6165d7ec38477e8cfa41bfa464959957953822 git Not specified
CNA Linux Linux affected a36a7fecfe6071732075ad5aa31196adce13181b 8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9 git Not specified
CNA Linux Linux affected a36a7fecfe6071732075ad5aa31196adce13181b 956ca5d72c76504824c8eb601879da9476973e15 git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/10f675902a5fc88ccfe34bb8aa37de50806b03b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/956ca5d72c76504824c8eb601879da9476973e15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b6165d7ec38477e8cfa41bfa464959957953822 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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