ACPI: processor_idle: Mark LPI enter functions as __cpuidle
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.
CVE-2026-80611
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80611
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a36a7fecfe6071732075ad5aa31196adce13181b",
"lessThan": "c17fe25dcb55ab94f6aa2930b7504ea666d5fcc2",
"versionType": "git"
},
{
"status": "affected",
"version": "a36a7fecfe6071732075ad5aa31196adce13181b",
"lessThan": "10f675902a5fc88ccfe34bb8aa37de50806b03b1",
"versionType": "git"
},
{
"status": "affected",
"version": "a36a7fecfe6071732075ad5aa31196adce13181b",
"lessThan": "5b6165d7ec38477e8cfa41bfa464959957953822",
"versionType": "git"
},
{
"status": "affected",
"version": "a36a7fecfe6071732075ad5aa31196adce13181b",
"lessThan": "8bbe4dd7964552f74c271c3a8d95a4331a8ab5f9",
"versionType": "git"
},
{
"status": "affected",
"version": "a36a7fecfe6071732075ad5aa31196adce13181b",
"lessThan": "956ca5d72c76504824c8eb601879da9476973e15",
"versionType": "git"
}
],
"programFiles": [
"drivers/acpi/processor_idle.c",
"drivers/acpi/riscv/cpuidle.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/acpi/processor_idle.c",
"drivers/acpi/riscv/cpuidle.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80611
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46609 · Revision 1
- Added to Heist Feed
- Publisher date