CVE-2026-80611: ACPI: processor_idle: Mark LPI enter functions as __cpuidle

mediumCVSS 5.5CVE-2026-80611

CSIRTS triage

vendor: Linux product: Linux KernelOther

What: The ACPI processor_idle driver's LPI enter functions are not marked with __cpuidle, potentially causing incorrect function profiling and tracing.
Who is affected: Systems using ACPI Low Power Idle (LPI) on supported architectures.
Urgency: Medium severity (CVSS 5.5); should be patched in routine updates to ensure correct system behavior.
Action: Apply kernel security patch addressing CVE-2026-80611 when available from your distribution.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80611

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-806110.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-80611	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for ACPI

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-80611: In the Linux kernel, the following vulnerability has been resolved: ACPI: processor_idle: Mark…nvd · 2026-08-28
unknownCVE-2026-72432: In the Linux kernel, the following vulnerability has been resolved: tpm_crb: Check ACPI_COMPAN…nvd · 2026-08-15
unknownCVE-2026-72026: In the Linux kernel, the following vulnerability has been resolved: irqchip/irq-riscv-imsic-ea…nvd · 2026-08-15
criticalCVE-2026-68325: iommu/amd: Bound the early ACPI HID mapmsrc · 2026-08-11
lowCVE-2026-68238: drm/amdgpu: Release VFCT ACPI table referencemsrc · 2026-08-11
unknownCVE-2026-68346: In the Linux kernel, the following vulnerability has been resolved: ALSA: hda: cs35l41: valida…nvd · 2026-08-10