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CVE-2026-97446

Linux: ACPICA: Fix NULL pointer dereference in acpi_ns_custom_package()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in9936507ac0f2379787a2a805b11ab1cf0f241372Also 644888605f55395e6012ed43e3ed643ef7ab5013, 08c5dee5da1d8d99b5a4e94db5a3d873c491771e and 2 moreCVE List
Published24 Sep 2026Updated 3 Oct 2026CVE List

What fixes it

  • 9936507ac0f2379787a2a805b11ab1cf0f241372LinuxCVE List
  • 644888605f55395e6012ed43e3ed643ef7ab5013LinuxCVE List
  • 08c5dee5da1d8d99b5a4e94db5a3d873c491771eLinuxCVE List
  • 3762c6c8ae5073892d7cec736cc54270c7c9ce90LinuxCVE List
  • 3cbf096a478f4fa03953f0685ad28c9c82ce67cbLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 16

  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before fad537538cdfcdc51e41db61bbf9ebe5ed9427ebCVE List
  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before 9936507ac0f2379787a2a805b11ab1cf0f241372CVE List
  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before 644888605f55395e6012ed43e3ed643ef7ab5013CVE List
  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before 08c5dee5da1d8d99b5a4e94db5a3d873c491771eCVE List
  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before 3762c6c8ae5073892d7cec736cc54270c7c9ce90CVE List
  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before 3cbf096a478f4fa03953f0685ad28c9c82ce67cbCVE List
  • Linuxaffected: 7952d40240855932de01bbe81c02bf1416ec91d8 before f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bcCVE List
  • Linuxaffected: 4.7CVE List
  • Linuxunaffected: all versions before 4.7CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 7