{"apiVersion":"1.0","identifier":"CVE-2026-80611","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.","publishedAt":"2026-08-28T08:16:45","lastModifiedAt":"2026-08-28T08:16:45","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80611","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00168,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-80611","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-80611","en":"https://www.redsauce.net/en/cves/CVE-2026-80611","fr":"https://www.redsauce.net/fr/cves/CVE-2026-80611","pt":"https://www.redsauce.net/pt/cves/CVE-2026-80611","de":"https://www.redsauce.net/de/cves/CVE-2026-80611","sk":"https://www.redsauce.net/sk/cves/CVE-2026-80611","el":"https://www.redsauce.net/el/cves/CVE-2026-80611"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-80611"}}