In the Linux kernel, the following vulnerability has been resolved:
ACPI: x86: Add adev NULL check to acpiquirkskipserdevenumeration()
acpidevhid_match() does not check for adev == NULL, dereferencing it unconditional.
Add a check for adev being NULL before calling acpidevhid_match().
At the moment acpiquirkskipserdevenumeration() is never called with a controller_parent without an ACPI companion, but better safe than sorry.