CVE-2026-64227 is a vulnerability in Linux Kernel
Published on July 24, 2026
ACPI: driver: Check ACPI_COMPANION() against NULL during probe
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.
Products Associated with CVE-2026-64227
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below f1e12d81f9cd250e722da01c7670b518d4181406 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a9451bf561232314755baf69a5916e0ac77f33fc is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 34f4d0e4e5065237d15651df759a99e81b7f9f51 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 612ddab8fce04394bd7aebe8e0f2599642e30859 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below e4865a56d013e86e46ea6acea15bb6eae01898ff is affected.
- Before 6.6.145 is affected.
- Before 6.12.97 is affected.
- Before 6.18.40 is affected.
- Before 7.0.11 is affected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.