[CVE-2026-53022][MODERATE 7.0] platform/x86: dell-wmi-sysman: bound enumeration string aggregation [ Upstream

[AL-KERNEL <alkernel@kernelcve.org>]

CVE: CVE-2026-53022
Priority: MODERATE 7.0
AL-KERNEL base severity: MODERATE
KPANIC flag: YES
Patch: platform/x86: dell-wmi-sysman: bound enumeration string aggregation [ Upstream
Commit: 7b3dc1f764bf24eb99474a5de8173b0b43a8b071
Upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7b3dc1f764bf24eb99474a5de8173b0b43a8b071
Original CVE announcement: https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-53022
Analysis date: Wed, 24 Jun 2026 16:13:25 -0400
ActionableScore: 5
ActionableScore lower bound: 4
Actionable bucket: Actionable Moderate at minimum
Manual review required: YES

Summary:
A firmware-provided Dell WMI enumeration package can overflow fixed 512-byte kernel buffers during string aggregation, causing kernel memory corruption and likely DoS, with possible higher impact depending on firmware control and adjacent object layout.

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ABOUT THIS REPORT
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The original Linux kernel CVE announcement for CVE-2026-53022 is available here:
https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-53022

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: MODERATE 7.0
Manual review required: YES

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

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AL-KERNEL CLASSIFICATION RESULT
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CVE-2026-53022	MODERATE	CHECK	Maybe valid. Check manually. Hints by AL-KERNEL: The best (paranoid) CVSS is 'AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H';*CWE-787;CWE-120;*CWE-20;Other CVSS 'AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H';BEST CVSS score: '7';DESCR 'dell-wmi-sysman aggregates firmware provided enumeration strings into fixed 512 byte kernel buffers. The old code bounded each individual source string but appended all strings and separators with strcat without checking remaining destination space, so a crafted enumeration package can cause an out of bounds write in kernel memory. For the CVSS the PR:L is used for the paranoid score because some environments may delegate Dell WMI or BIOS management to a reduced capability local administrator or service account rather than full system root. The issue is not network reachable and normally requires local platform management access or control over firmware supplied WMI data. Impact is at least local denial of service via memory corruption and in worst case may allow confidentiality or integrity impact, so manual review is required.';YES REQUIRES MANUAL CHECK; ,and ActionableScore result is Actionable Moderate at minimum (with actual score 5)	YES	 KPANIC INCREASED_TO_MODERATE_FROM_LOW_BASED_ON_GUESSCVSS	NO	NO	checked

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ACTIONABLESCORE ANALYSIS
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ActionableScore=5
ActionableScoreLower=4

## 1. ActionableScore

* Conservative score: **4**
* Paranoid score: **5**
* Final recommended bucket: **Actionable Moderate at minimum**::

## 2. Signal breakdown

Conservative signals:

* **Firmware-mediated external influence: +1**
  The overflowing strings come from firmware-provided ACPI/WMI enumeration data rather than from ordinary packet or syscall input.

* **Constrained kernel buffer overwrite: +1**
  The old code used repeated `strcat()` into fixed 512-byte members without checking remaining space. This is an OOB write, but the destination is fixed and attacker target selection is not shown.

* **Privileged kernel/device-management memory corruption path: +1**
  The corruption occurs in a platform driver handling firmware-fed system management data.

* **Availability impact realistic: +1**
  A malformed enumeration package can plausibly corrupt adjacent kernel memory and crash or destabilize the driver/kernel.

Paranoid additional interpretation:

* **Generic memory corruption, stronger OOB write concern: +1 additional**
  If firmware/WMI data is attacker-influenced in a given environment, the repeated string append can become a more meaningful kernel heap/global structure corruption primitive.

Discounts / limits:

* **Not remote reachable: +0**
  No realistic network path is shown.

* **No local unprivileged trigger in typical deployments: +0**
  Ordinary users generally cannot supply arbitrary Dell WMI firmware enumeration packages.

* **Rare / hardware-specific exposure: -1 already reflected in conservative treatment**
  The affected path is Dell WMI systems management, not a broad kernel core path.

* **No strong LPE bonus**
  The patch shows an OOB write, but not attacker-controlled reclaim, arbitrary target selection, function pointer control, type confusion, or a demonstrated privilege escalation chain.

## 3. Reachability analysis

The bug is reachable when the `dell-wmi-sysman` driver parses firmware-provided enumeration data for Dell platform management attributes. The direct input source is ACPI/WMI firmware data, so practical attacker control normally requires malicious firmware, compromised platform management, or an environment where BIOS/WMI management is delegated to a local service or reduced-capability administrator.

Namespaces and containers usually do not make this directly reachable, because container users normally cannot control host firmware WMI responses. However, enterprise management tooling or delegated platform-management services could lower the practical privilege boundary in some deployments.

The path is hardware and vendor specific. It is not Internet reachable and not triggered by normal network traffic.

## 4. Severity interpretation

This is more than an ordinary validation cleanup because the old code performs unbounded aggregation into fixed-size kernel buffers. The realistic impact is most likely local or firmware-mediated denial of service through kernel memory corruption.

The theoretical worst case includes confidentiality or integrity impact if the overflow can be shaped to corrupt useful adjacent kernel state, but the patch does not demonstrate arbitrary write, target selection, object reuse, or a reliable LPE primitive. Therefore it is best treated as **Actionable Moderate at minimum**, with manual review justified by the kernel OOB write class.

## 5. One-sentence report phrase

A firmware-provided Dell WMI enumeration package can overflow fixed 512-byte kernel buffers during string aggregation, causing kernel memory corruption and likely DoS, with possible higher impact depending on firmware control and adjacent object layout.

## 6. Manual review recommendation

**MANUAL CHECK REQUIRED**

Reason: this is a kernel out-of-bounds write in a firmware-fed platform driver. Even though reachability is limited and no concrete privilege escalation primitive is shown, the memory corruption class and trusted device-management context make auto-closure unsafe.

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

Patch: platform/x86: dell-wmi-sysman: bound enumeration string aggregation [ Upstream
Commit: 7b3dc1f764bf24eb99474a5de8173b0b43a8b071
Upstream URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7b3dc1f764bf24eb99474a5de8173b0b43a8b071

Changed files:
  drivers/platform/x86/dell/dell-wmi-sysman/enum-attributes.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=7b3dc1f764bf24eb99474a5de8173b0b43a8b071

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

The original Linux kernel CVE announcement for CVE-2026-53022 can be found here:
https://lore.kernel.org/linux-cve-announce/?q=CVE-2026-53022

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:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H
  The Best / paranoid CVSS vector: AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  The Best / paranoid CVSS score: 7

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: 4
  Paranoid ActionableScore: 5

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: MODERATE
KPANIC detected for this report: YES
Published priority for this report (same as in Subject): MODERATE 7.0

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).