CVE-2026-97446

ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()

State: Published
Severity: Not scored
Published: Sep 24, 2026
Updated: Oct 3, 2026
Reserved: Sep 24, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	7952d40240855932de01bbe81c02bf1416ec91d8 to before fad537538cdfcdc51e41db61bbf9ebe5ed9427ebAffected 7952d40240855932de01bbe81c02bf1416ec91d8 to before 9936507ac0f2379787a2a805b11ab1cf0f241372Affected 7952d40240855932de01bbe81c02bf1416ec91d8 to before 644888605f55395e6012ed43e3ed643ef7ab5013Affected 7952d40240855932de01bbe81c02bf1416ec91d8 to before 08c5dee5da1d8d99b5a4e94db5a3d873c491771eAffected 7952d40240855932de01bbe81c02bf1416ec91d8 to before 3762c6c8ae5073892d7cec736cc54270c7c9ce90Affected 7952d40240855932de01bbe81c02bf1416ec91d8 to before 3cbf096a478f4fa03953f0685ad28c9c82ce67cbAffected 7952d40240855932de01bbe81c02bf1416ec91d8 to before f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bcAffected
LinuxLinux	4.7Affected before 4.7Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

7952d40240855932de01bbe81c02bf1416ec91d8 to before fad537538cdfcdc51e41db61bbf9ebe5ed9427ebAffected
7952d40240855932de01bbe81c02bf1416ec91d8 to before 9936507ac0f2379787a2a805b11ab1cf0f241372Affected
7952d40240855932de01bbe81c02bf1416ec91d8 to before 644888605f55395e6012ed43e3ed643ef7ab5013Affected
7952d40240855932de01bbe81c02bf1416ec91d8 to before 08c5dee5da1d8d99b5a4e94db5a3d873c491771eAffected
7952d40240855932de01bbe81c02bf1416ec91d8 to before 3762c6c8ae5073892d7cec736cc54270c7c9ce90Affected
7952d40240855932de01bbe81c02bf1416ec91d8 to before 3cbf096a478f4fa03953f0685ad28c9c82ce67cbAffected
7952d40240855932de01bbe81c02bf1416ec91d8 to before f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bcAffected

LinuxLinux

4.7Affected
before 4.7Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2 and laterNot affected

References

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