CVE-2026-64227

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f1e12d81f9cd250e722da01c7670b518d4181406affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a9451bf561232314755baf69a5916e0ac77f33fcaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 34f4d0e4e5065237d15651df759a99e81b7f9f51affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 612ddab8fce04394bd7aebe8e0f2599642e30859affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e4865a56d013e86e46ea6acea15bb6eae01898ffaffected
LinuxLinux0 < 6.6.145affected
LinuxLinux0 < 6.12.97affected
LinuxLinux0 < 6.18.40affected
LinuxLinux0 < 7.0.11affected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References