CVE-2026-64512: ACPI: CPPC: Suppress UBSAN warning caused by field misuse

CSIRTS triage

What

A UBSAN warning caused by field misuse in the CPPC component has been suppressed.

Who is affected

Deployments using ACPI with CPPC are affected.

Urgency

Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.

Action

Update to the latest version of the ACPI component.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

low — CVSS 1.9

Published

2026-07-14

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64512

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-2026-645120.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownCVE-2026-64512: In the Linux kernel, the following vulnerability has been resolved: ACPI: CPPC: Suppress UBSAN…nvd

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