ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package() (CVE-2026-97446) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-97446

ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()

Answer in brief

CVE-2026-97446 records a Unknown severity vulnerability in ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3762c6c8ae5073892d7cec736cc54270c7c9ce90 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3cbf096a478f4fa03953f0685ad28c9c82ce67cb \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	3762c6c8ae5073892d7cec736cc54270c7c9ce90, 3cbf096a478f4fa03953f0685ad28c9c82ce67cb, f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bc, 6.12.111, 6.18.53

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to 3762c6c8ae5073892d7cec736cc54270c7c9ce90 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.