---
id: CVE-2026-97446
title: |-
  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 _BI…
summary: |-
  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 _BI…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3762c6c8ae5073892d7cec736cc54270c7c9ce90
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3cbf096a478f4fa03953f0685ad28c9c82ce67cb
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc
  - Linux < 6.12.111
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T13:17:28.393'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97446'
references:
  - url: 'https://git.kernel.org/stable/c/3762c6c8ae5073892d7cec736cc54270c7c9ce90'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3cbf096a478f4fa03953f0685ad28c9c82ce67cb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T16:47:15.877Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.