[CVE-2026-93129][LOW] platform/x86: dell-wmi-base: Fix handling of ultra performance key [ Upstream

[CVE-2026-93129][LOW] platform/x86: dell-wmi-base: Fix handling of ultra performance key [ Upstream

[AL-KERNEL]

CVE: CVE-2026-93129
Priority: LOW
AL-KERNEL base severity: LOW
KPANIC flag: NO
Patch: platform/x86: dell-wmi-base: Fix handling of ultra performance key [ Upstream
Commit: 392c19faec6bf4cb72fb02322e2a61e198dd8f72
Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=392c19faec6bf4cb72fb02322e2a61e198dd8f72
Original CVE announcement: https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-93129
Analysis date: Fri, 18 Sep 2026 02:48:02 -0400
ActionableScore: 2
ActionableScore lower bound: 1
Actionable bucket: Ordinary Moderate
Manual review required: NO

Summary:
No one-sentence report phrase was found.

======================================================================
ABOUT THIS REPORT
======================================================================

The original Linux kernel CVE announcement for CVE-2026-93129 is available here:
https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-93129

The original announcement does not normally provide a security severity
estimate, CVSS assessment, or enough information to determine whether the
reported kernel bug represents a practically relevant security issue.

This report was generated by AL-KERNEL, an AI-assisted Linux kernel
vulnerability analysis system developed by Alexander Larkin. It combines
an autonomous classifier with LLM-assisted technical analysis and a
separate ActionableScore mechanism.

The purpose of this report is to prioritize Linux kernel CVEs before
manual review, identify cases that require prompt investigation, and
support automatic closure of issues that are unlikely to have meaningful
security impact.

Published priority for this report: LOW
Manual review required: NO

A detailed explanation of the methodology and priority rules is included
at the end of this message.

======================================================================
AL-KERNEL CLASSIFICATION RESULT
======================================================================

CVE-2026-93129	LOW	https://www.kernelcve.org/list/?q=CVE-2026-93129 CHECK WITH IMPACT FROM ORIG NN MODERATE	Maybe valid. Check manually. Hints by AL-KERNEL: The best (paranoid) CVSS is 'AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L';CWE-126;CWE-125;*CWE-20;Other CVSS 'AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N';BEST CVSS score: '4.3';DESCR 'An out of bounds read in dell_wmi_process_key can occur when the Dell WMI ultra performance key event is parsed. The event buffer passed to the handler already starts after the type and code fields, but the vulnerable code reads buffer index 2 instead of the first data field. This can read beyond the provided event data and may cause incorrect key state handling or a kernel fault on affected Dell systems. For the CVSS the PR:N because the plausible trigger is a firmware or hardware key event and does not require OS privileges, but exploitation still requires physical access to an affected Dell platform or equivalent control of WMI events. The issue is not network reachable. Impact is low and is limited to a potential local policy or state error and possible denial of service rather than privilege escalation.';NO MANUAL CHECK; ,and ActionableScore result is Ordinary Moderate (with actual score 2)  SKIP CVE-2026-93129 UNKNOWN SKIP The Fixes patch not applied yet, so unlikely that actual: url YES  NO NO unknown 	MAYBE	SIMPLEFIX  DECREASED_TO_MODERATE_REGULAR_FROM_MODERATE7_BASED_ON_GUESSCVSS DECREASED_TO_LOW_FROM_MODERATE_BASED_ON_ACTIONABLESCORELESSTHAN3	-	-	checked

======================================================================
ACTIONABLESCORE ANALYSIS
======================================================================

ActionableScore=2
ActionableScoreLower=1
PrimitiveClass=CLASS_C
RealUAF=NO
HostAdminRequired=NO
NamespaceScopedPrivilege=NO
ImportantCandidate=NO
ManualReview=NO
AutoDowngradeAllowed=YES

1. ActionableScore

* Raw conservative score: 1
* Conservative score: 1
* Raw paranoid score: 2
* Paranoid score: 2
* Final recommended bucket: **Ordinary Moderate**::

No floor or cap changed the score.

2. Signal breakdown

Positive signals:

* +1: Limited read-only OOB / invalid read. The code used `buffer[2]` although the parsed event buffer already starts after the type and code fields, so the correct first data element is `buffer[0]`.
* +1 paranoid only: Firmware or hardware mediated trigger. A Dell WMI ultra performance key event can plausibly reach the path without OS-level privileges, but attacker control is mediated by platform firmware or physical/device event generation.

Non-awarded signals:

* Real UAF not awarded. No stale lifetime, refcount, RCU, or post-free object use is established.
* Controlled corruption not awarded. The patch shows an overread, not an overwrite.
* Confidentiality impact not awarded conservatively. No user-visible disclosure path is shown.
* Integrity impact not awarded beyond possible incorrect key state handling. No protected kernel state modification is established.
* Reliable kernel crash not awarded. The commit says potential buffer overread, but does not establish a demonstrated host-wide crash.
* Remote reachability not awarded. This is not packet or network triggered.
* Strong LPE or weak LPE not awarded. No reclaim, arbitrary write, callback control, credential manipulation, or authorization bypass is shown.

3. Reachability analysis

The plausible trigger is a Dell WMI ultra performance key event on affected Dell platforms. This does not require host administrator privileges in the OS, but it does require physical access to the relevant key or equivalent control over platform WMI event generation. The issue is not namespace scoped. No network trigger is established. No prior host configuration beyond running on affected Dell hardware with the relevant driver path is shown. There is no race condition and no repeatability concern beyond generating the platform event again.

4. Primitive and severity interpretation

The exact primitive is a small read-only buffer overread caused by using the wrong parsed-buffer index. This is not an active structured UAF and not fixed stale storage. There is no concrete repeated release or refcount operation. The behavior is best classified as CLASS_C because the demonstrated issue is invalid read / invalid state handling without an independently useful corruption primitive.

Demonstrated consequence is potential incorrect event handling and possible low-impact local fault on affected hardware. Speculative consequence is limited disclosure or availability impact if the overread reaches sensitive adjacent data or faults, but no disclosure sink or crash evidence is established. ImportantCandidate is NO because no Class A or meaningful Class B primitive exists. AutoDowngradeAllowed is YES because this is a constrained hardware-specific OOB read with no memory corruption, UAF, security-boundary bypass, or LPE evidence.

5. One-sentence report phrase

A Dell WMI ultra performance key event may cause dell_wmi_process_key() to read the wrong parsed event-buffer index, resulting in a small local buffer overread with low practical impact and no demonstrated privilege escalation path.

6. Manual review recommendation

NO MANUAL CHECK NEEDED

Reason: the patch establishes only a constrained read-only overread in a hardware-specific event path, with no UAF, overwrite, disclosure path, network reachability, or authorization bypass.

7. Call-site confidence

Call-site confidence: medium

======================================================================
UPSTREAM PATCH SUMMARY
======================================================================

Patch: platform/x86: dell-wmi-base: Fix handling of ultra performance key [ Upstream
Commit: 392c19faec6bf4cb72fb02322e2a61e198dd8f72
Upstream URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=392c19faec6bf4cb72fb02322e2a61e198dd8f72

Changed files:
  drivers/platform/x86/dell/dell-wmi-base.c

Diff excerpt:

Not included in this email. See the upstream URL for the full patch.

Full patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=392c19faec6bf4cb72fb02322e2a61e198dd8f72

======================================================================
DETAILED REPORT METHODOLOGY
======================================================================

The original Linux kernel CVE announcement for CVE-2026-93129 can be found here:
https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-93129

The original CVE announcement normally does not include a security-level
estimate. In particular, it may not contain a CVSS assessment, an impact
level, or enough information to determine whether the reported bug is a
practically relevant security issue. One purpose of this parallel CVE list
is to provide that missing technical and prioritization information.

The original goal of the AL-KERNEL project was to prioritize Linux kernel
CVE analysis automatically before manual review. The system can also help
identify non-security issues that may be suitable for automatic closure.

This report was generated by AL-KERNEL, an AI-assisted Linux kernel
vulnerability analysis system developed by Alexander Larkin.

The first analysis stage combines an autonomous classifier with additional
LLM-based analysis. The autonomous classifier runs locally on a CPU and is
based on a backpropagation neural network. Together, these mechanisms
produce a technical vulnerability description, identify likely weakness
types, estimate CVSS severity, and provide input for ActionableScore.

Two CVSS estimates are retained because incomplete kernel vulnerability
information often permits more than one defensible interpretation:

  Conservative CVSS vector: AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  The Best / paranoid CVSS vector: AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  The Best / paranoid CVSS score: 4.3

The conservative vector represents a lower-impact interpretation.
The Best/paranoid vector intentionally represents a plausible upper-bound
interpretation and should not automatically be treated as demonstrated
real-world impact.

CVSS may also need to be adjusted for a particular Linux deployment,
because actual reachability, privileges, enabled kernel configuration,
hardware, namespaces, exposed device nodes, and other environmental
conditions can differ significantly between systems.

A separate ActionableScore mechanism evaluates practical remediation
urgency. Its analysis may include reachability, attack prerequisites,
subsystem exposure, memory-corruption characteristics, denial-of-service
reliability, and possible confidentiality, integrity, or
privilege-escalation impact.

  Conservative ActionableScore: 1
  Paranoid ActionableScore: 2

The final base severity is taken directly from the second tab-separated
field of the AL-KERNEL classification result. ActionableScore does not
replace or independently override that final AL-KERNEL decision, and
if ActionableScore adjusted impact level of ALKERNEL, then you would see
self-readable flags above like INCREASED_TO_HIGH_BASED_ON_ACTIONABLESCOREHIGHEREQTHAN7.

For an AL-KERNEL result of MODERATE, this report uses the following
additional presentation split:

  ActionableScore below 5   -> MODERATE REGULAR
  ActionableScore 5 or more -> MODERATE 7.0

The distinction between MODERATE REGULAR and MODERATE 7.0 makes it
possible to identify Moderate issues that should receive manual analysis
and fixes before lower-priority MODERATE REGULAR issues. In many cases,
MODERATE REGULAR fixes may wait for a later rebase or routine update.

There is one override in which MODERATE REGULAR becomes MODERATE 7.0
even when the ActionableScore is below 5. When the AL-KERNEL result
contains the KPANIC flag, a MODERATE result is always presented as
MODERATE 7.0. The KPANIC flag selected with few regexps without
usage of AI at all, so it helps to detect cases when Kernel Crash happens
and similar (to filter False-Negative results from the LLM usage).

KPANIC indicates that a reliable kernel crash, kernel panic, or similarly
serious kernel availability impact was identified by the classification
workflow.

AL-KERNEL base severity for this report: LOW
KPANIC detected for this report: NO
Published priority for this report (same as in Subject): LOW

These results are intended to support engineering triage. They are
machine-generated estimates, and cases marked for manual review should
be validated by a human security engineer before final disposition.
For more info read docs linked from here: https://kernelcve.org/
(and you can submit you own patch there to generate such a report
for non-existant CVE-id yet).

Note that in many cases this AI tool selects higher severity, than
real is (means you can expect Importants instead of Moderate 7.0 or
Moderates 7.0 instead of regular Moderates). If you see such cases,
please use reply email interface to add additional manual analyses
info to this particular CVE.
And please, please, let me know when you see Lows instead of Importants
or Important instead of Low (because particular for such cases I
need to tune this AI tool to make it better for this one and next similar).
My contact email for such notifications is alexanjelausa@gmail.com (and both
send reply to CVE record itself too and see "reply" button below for howto reply).