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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 08c5dee5da1d8d99b5a4e94db5a3d873c491771e, 3762c6c8ae5073892d7cec736cc54270c7c9ce90, 3cbf096a478f4fa03953f0685ad28c9c82ce67cb; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 08c5dee5da1d8d99b5a4e94db5a3d873c491771e, 3762c6c8ae5073892d7cec736cc54270c7c9ce90, 3cbf096a478f4fa03953f0685ad28c9c82ce67cb; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.7affected
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before fad537538cdfcdc51e41db61bbf9ebe5ed9427ebaffected · git
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before 9936507ac0f2379787a2a805b11ab1cf0f241372affected · git
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before 644888605f55395e6012ed43e3ed643ef7ab5013affected · git
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before 08c5dee5da1d8d99b5a4e94db5a3d873c491771eaffected · git
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before 3762c6c8ae5073892d7cec736cc54270c7c9ce90affected · git
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before 3cbf096a478f4fa03953f0685ad28c9c82ce67cbaffected · git
    • 7952d40240855932de01bbe81c02bf1416ec91d8 and later · before f8d14b7bb0063bbbd86c0e4d73edb8cea7b362bcaffected · git
    • before 4.7not affected · semver
    • 5.10.271 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-97444Sep 24, 2026 · ACPICA: add boundary checks in two places
    30Monitor
  • ← EarlierCVE-2026-97445Sep 24, 2026 · ACPICA: Enhance buffer validation in acpi_ut_walk_aml_resources()
    30Monitor
  • Later →CVE-2026-97448Sep 24, 2026 · ACPICA: Add validation for node in acpi_ns_build_normalized_path()
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux08c5dee5da1d8d99b5a4e94db5a3d873c491771eVendor (CNA)
Linux Linux3762c6c8ae5073892d7cec736cc54270c7c9ce90Vendor (CNA)
Linux Linux3cbf096a478f4fa03953f0685ad28c9c82ce67cbVendor (CNA)
Linux Linux644888605f55395e6012ed43e3ed643ef7ab5013Vendor (CNA)
Linux Linux9936507ac0f2379787a2a805b11ab1cf0f241372Vendor (CNA)
Linux Linuxf8d14b7bb0063bbbd86c0e4d73edb8cea7b362bcVendor (CNA)
Linux Linuxfad537538cdfcdc51e41db61bbf9ebe5ed9427ebVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records