ACPI: processor_idle: Mark LPI enter functions as __cpuidle (CVE-2026-80611) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80611

ACPI: processor_idle: Mark LPI enter functions as __cpuidle

Answer in brief

CVE-2026-80611 records a Unknown severity vulnerability in ACPI: processor_idle: Mark LPI enter functions as __cpuidle. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=a36a7fecfe6071732075ad5aa31196adce13181b <10f675902a5fc88ccfe34bb8aa37de50806b03b1 \|\| >=a36a7fecfe6071732075ad5aa31196adce13181b <5b6165d7ec38477e8cfa41bfa464959957953822 \|\| >=a36a7fecfe6071732075ad5aa31196adce13181b <8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9 \|\| >=a36a7fecfe6071732075ad5aa31196adce13181b <956ca5d72c76504824c8eb601879da9476973e15	10f675902a5fc88ccfe34bb8aa37de50806b03b1, 5b6165d7ec38477e8cfa41bfa464959957953822, 8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9, 956ca5d72c76504824c8eb601879da9476973e15
Linux/Linuxgeneric	4.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 10f675902a5fc88ccfe34bb8aa37de50806b03b1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.