CVE-2026-97446

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

ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()

acpi_ns_custom_package() unconditionally dereferences the first element

of the package to read the _BIX version number, without checking for

NULL:

if ((*Elements)->Common.Type != ACPI_TYPE_INTEGER)

When firmware returns a _BIX package whose first element is an

unresolvable reference, ACPICA evaluates that entry to NULL.

acpi_ns_remove_null_elements() does not strip NULL entries for

ACPI_PTYPE_CUSTOM packages (fixed-position format would break if

elements were shifted), so acpi_ns_custom_package() sees the NULL

and causes a crash.

Add a NULL check for the first element (version field) before

dereferencing it. The caller then receives AE_AML_OPERAND_TYPE

instead of crashing.