ACPI: processor: Unregister cpufreq notifier on init failure (CVE-2026-90364) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90364

ACPI: processor: Unregister cpufreq notifier on init failure

Answer in brief

CVE-2026-90364 records a Unknown severity vulnerability in ACPI: processor: Unregister cpufreq notifier on init failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=c0e0421a60bf468e88cf569fbd727346b138ed04 <ccee0785030978c49505e04954eee3f30a5f01ca \|\| >=c0e0421a60bf468e88cf569fbd727346b138ed04 <8f3036c5de8b651880f323e223b1604b6cfbff21 \|\| >=c0e0421a60bf468e88cf569fbd727346b138ed04 <64976f3b34b07eb866ead4052cefe7e9ff45fd2f \|\| >=c0e0421a60bf468e88cf569fbd727346b138ed04 <182cd086b31ea4ccc1d8f2ec5b81e988dfe0b892 \|\| >=c0e0421a60bf468e88cf569fbd727346b138ed04 <06f32dd67e6b23a05bef0d8183c5335af91c0c3b	ccee0785030978c49505e04954eee3f30a5f01ca, 8f3036c5de8b651880f323e223b1604b6cfbff21, 64976f3b34b07eb866ead4052cefe7e9ff45fd2f, 182cd086b31ea4ccc1d8f2ec5b81e988dfe0b892, 06f32dd67e6b23a05bef0d8183c5335af91c0c3b
Linux/Linuxgeneric	6.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ccee0785030978c49505e04954eee3f30a5f01ca if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Unregister cpufreq notifier on init failure acpi_processor_driver_init() registers the cpufreq policy notifier before registering the ACPI processor driver and setting up CPU hotplug state. If driver_register() or cpuhp_setup_state() fails, the error path only unregisters the ACPI processor driver and the idle driver. The cpufreq notifier remains registered even though initialization failed. Mirror the module exit path on the init failure path and unregister the cpufreq notifier when it has been registered.

Quoted source text, attributed separately from HOL analysis.