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

What is CVE-2026-64227?

CVE-2026-64227 is a medium-severity vulnerability in Linux kernel, published on 24 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

ACPI: driver: Check ACPI_COMPANION() against NULL during probe

Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence.

Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices.

Also change the value returned by the ACPI thermal zone driver when the device's ACPI companion is not present to -ENODEV for consistency with the other drivers.

Weakness: CWE-476

Which versions are affected by CVE-2026-64227?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64227?

Apply the vendor's patch.

Is CVE-2026-64227 being exploited?

There is no known exploitation of CVE-2026-64227 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-64227, DEBIAN-CVE-2026-64227, GHSA-pr66-3h83-6g86, ROOT-OS-UBUNTU-2204-CVE-2026-64227, UBUNTU-CVE-2026-64227.