CVE-2026-64227: ACPI: driver: Check ACPI_COMPANION() against NULL during probe

highCVSS 7.1CVE-2026-64227

CSIRTS triage

Other

What: This vulnerability involves a check against NULL during the ACPI probe.
Who is affected: Deployments using the affected ACPI driver.
Urgency: Remediation is important to ensure system stability during ACPI operations.
Action: Apply the fix for CVE-2026-64227.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64227

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-2026-642270.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64227	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[NEW] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownDSA-6405-1 linux - security updatedebian
highUSN-8618-1: Linux kernel vulnerabilitiesubuntu
unknownCVE-2026-64227: In the Linux kernel, the following vulnerability has been resolved: ACPI: driver: Check ACPI_C…nvd

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-2026-64512: In the Linux kernel, the following vulnerability has been resolved: ACPI: CPPC: Suppress UBSAN…nvd · 2026-07-25
unknownCVE-2026-64511: In the Linux kernel, the following vulnerability has been resolved: ACPI: NFIT: core: Fix poss…nvd · 2026-07-25
highCVE-2026-64510: In the Linux kernel, the following vulnerability has been resolved: ACPI: NFIT: core: Fix acpi…nvd · 2026-07-25
highCVE-2026-64372: In the Linux kernel, the following vulnerability has been resolved: cpufreq: pcc: fix use-afte…nvd · 2026-07-25
unknownCVE-2026-64227: In the Linux kernel, the following vulnerability has been resolved: ACPI: driver: Check ACPI_C…nvd · 2026-07-24
unknownCVE-2026-64183: In the Linux kernel, the following vulnerability has been resolved: efi: Allocate runtime work…nvd · 2026-07-19