CVE-2026-80611 (GCVE-0-2026-80611)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
Title
ACPI: processor_idle: Mark LPI enter functions as __cpuidle
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a36a7fecfe6071732075ad5aa31196adce13181b , < 10f675902a5fc88ccfe34bb8aa37de50806b03b1 (git)
Affected: a36a7fecfe6071732075ad5aa31196adce13181b , < 5b6165d7ec38477e8cfa41bfa464959957953822 (git)
Affected: a36a7fecfe6071732075ad5aa31196adce13181b , < 8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9 (git)
Affected: a36a7fecfe6071732075ad5aa31196adce13181b , < 956ca5d72c76504824c8eb601879da9476973e15 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/acpi/processor_idle.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: processor_idle: Mark LPI enter functions as __cpuidle\n\nWhen function tracing or Kprobes is enabled, entering an ACPI Low\nPower Idle (LPI) state triggers the following RCU splat:\n\n  RCU not on for: acpi_idle_lpi_enter+0x4/0xd8\n  WARNING: CPU: 8 PID: 0 at include/linux/trace_recursion.h:162 function_trace_call+0x1e8/0x228\n\nThe acpi_idle_lpi_enter() function is invoked within the cpuidle\npath after RCU has already been disabled for the current local CPU.\nConsequently, ftrace\u0027s function_trace_call() expects RCU to be\nactively watching before recording trace data, emitting a warning\nif it is not.\n\nFix this by annotating acpi_idle_lpi_enter(), the generic __weak\nstub, and the RISC-V implementation of acpi_processor_ffh_lpi_enter()\nwith __cpuidle. This moves these functions into the \u0027.cpuidle.text\u0027\nsection, implicitly disabling ftrace instrumentation (notrace) along\nthis sensitive path and preventing trace-induced RCU warnings during\nidle entry."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:33.934Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/10f675902a5fc88ccfe34bb8aa37de50806b03b1"
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        },
        {
          "url": "https://git.kernel.org/stable/c/8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/956ca5d72c76504824c8eb601879da9476973e15"
        }
      ],
      "title": "ACPI: processor_idle: Mark LPI enter functions as __cpuidle",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80611",
    "datePublished": "2026-08-28T06:48:33.934Z",
    "dateReserved": "2026-08-26T14:34:25.773Z",
    "dateUpdated": "2026-08-28T06:48:33.934Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-01",
      "epss": "0.00168",
      "percentile": "0.06287"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-01T10:43:08+00:00",
      "cve": "CVE-2026-80611",
      "id": "CVE-2026-80611",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ACPI: processor_idle: Mark LPI enter functions as __cpuidle",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80611.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.