FKIE_CVE-2026-80611

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10f675902a5fc88ccfe34bb8aa37de50806b03b1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b6165d7ec38477e8cfa41bfa464959957953822
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/956ca5d72c76504824c8eb601879da9476973e15
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/processor_idle.c",
            "drivers/acpi/riscv/cpuidle.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "10f675902a5fc88ccfe34bb8aa37de50806b03b1",
              "status": "affected",
              "version": "a36a7fecfe6071732075ad5aa31196adce13181b",
              "versionType": "git"
            },
            {
              "lessThan": "5b6165d7ec38477e8cfa41bfa464959957953822",
              "status": "affected",
              "version": "a36a7fecfe6071732075ad5aa31196adce13181b",
              "versionType": "git"
            },
            {
              "lessThan": "8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9",
              "status": "affected",
              "version": "a36a7fecfe6071732075ad5aa31196adce13181b",
              "versionType": "git"
            },
            {
              "lessThan": "956ca5d72c76504824c8eb601879da9476973e15",
              "status": "affected",
              "version": "a36a7fecfe6071732075ad5aa31196adce13181b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/processor_idle.c",
            "drivers/acpi/riscv/cpuidle.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    }
  ],
  "id": "CVE-2026-80611",
  "lastModified": "2026-08-28T08:16:45.080",
  "metrics": {},
  "published": "2026-08-28T08:16:45.080",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/10f675902a5fc88ccfe34bb8aa37de50806b03b1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b6165d7ec38477e8cfa41bfa464959957953822"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/956ca5d72c76504824c8eb601879da9476973e15"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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