Unknown

CVE-2026-90364 — ACPI: processor: Unregister cpufreq notifier on init failure

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.

Published Sep 17, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 18, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ c0e0421a60bf468e88cf569fbd727346b138ed04 and < ccee0785030978c49505e04954eee3f30a5f01ca≥ c0e0421a60bf468e88cf569fbd727346b138ed04 and < 8f3036c5de8b651880f323e223b1604b6cfbff21≥ c0e0421a60bf468e88cf569fbd727346b138ed04 and < 64976f3b34b07eb866ead4052cefe7e9ff45fd2f≥ c0e0421a60bf468e88cf569fbd727346b138ed04 and < 182cd086b31ea4ccc1d8f2ec5b81e988dfe0b892≥ c0e0421a60bf468e88cf569fbd727346b138ed04 and < 06f32dd67e6b23a05bef0d8183c5335af91c0c3bversion 6.3	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 18, 2026 · 3 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 17, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

5 on the record

git.kernel.org/stable/c/8f3036c5de8b651880f323e223b1604b6cfbff21
NIST National Vulnerability Database
git.kernel.org/stable/c/182cd086b31ea4ccc1d8f2ec5b81e988dfe0b892
NIST National Vulnerability Database
git.kernel.org/stable/c/06f32dd67e6b23a05bef0d8183c5335af91c0c3b
NIST National Vulnerability Database
git.kernel.org/stable/c/64976f3b34b07eb866ead4052cefe7e9ff45fd2f
NIST National Vulnerability Database
git.kernel.org/stable/c/ccee0785030978c49505e04954eee3f30a5f01ca
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 15h
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 15h
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 15h
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 15h
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 15h
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 15h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-90364 is "ACPI: processor: Unregister cpufreq notifier on init failure", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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