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Chengming 3900 FirmwareOperating system · Dell

CVE-2022-31226

HIGH · 7.8 CVSS v3.1 Published 2022-09-12
Fix available
A fix is available. Upgrade to 1.1.0 / 1.1.66 or later.
See remediation →
80/100
Remediation priority · High
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Dell BIOS versions contain a Stack-based Buffer Overflow vulnerability. A local authenticated malicious user could potentially exploit this vulnerability by sending excess data to a function in order to gain arbitrary code execution on the system.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-121

Data overflows a fixed-size buffer allocated on the stack, overwriting adjacent stack memory — including saved return addresses — which is the classic route to redirecting execution into attacker-supplied code. Crafted input is all it takes. Remediation is strict length checks, safe bounded string and memory functions, and modern stack-protection mitigations.

General guidance for the stack-based buffer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Chengming 3900 FirmwareOperating system
Affected:< 1.1.66
Inspiron 14 Plus 7420 FirmwareOperating system
Affected:< 1.2.0
Inspiron 16 Plus 7620 FirmwareOperating system
Affected:< 1.2.0
Inspiron 3910 FirmwareOperating system
Affected:< 1.1.66
Inspiron 5320 FirmwareOperating system
Affected:< 1.1.0
Inspiron 5420 FirmwareOperating system
Affected:< 1.4.1
Inspiron 5620 FirmwareOperating system
Affected:< 1.4.1
Inspiron 7420 FirmwareOperating system
Affected:< 1.3.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.1.0 / 1.1.66 / 1.2.0 or later
Fixed in 1.1.01.1.661.2.0
Vendor patch www.dell.com →
Recommended fix High confidence

BIOS firmware version 1.1.66 (Chengming 3900, Inspiron 3910), 1.2.0 (Inspiron 14 Plus 7420, Inspiron 16 Plus 7620), 1.1.0 (Inspiron 5320), 1.4.1 (Inspiron 5420, Inspiron 5620), or 1.3.0 (Inspiron 7420) depending on model

  1. Navigate to Dell support KB article 000202196 at https://www.dell.com/support/kbdoc/000202196
  2. Identify your exact Dell model from the affected products list (Chengming 3900, Inspiron 14 Plus 7420, Inspiron 16 Plus 7620, Inspiron 3910, Inspiron 5320, Inspiron 5420, Inspiron 5620, or Inspiron 7420)
  3. Download the BIOS update utility corresponding to your specific model and current firmware version
  4. Run the Dell BIOS update executable while connected to AC power (do not run on battery only)
  5. Allow the update to complete - the system will restart and flash the new BIOS firmware
  6. Verify the BIOS version has been updated to the fixed release (1.1.66 for Chengming 3900/Inspiron 3910, 1.2.0 for Inspiron 14 Plus 7420/Inspiron 16 Plus 7620, 1.1.0 for Inspiron 5320, 1.4.1 for Inspiron 5420/Inspiron 5620, or 1.3.0 for Inspiron 7420)
Caveat BIOS firmware updates carry inherent risk of system brick if interrupted; ensure stable power connection and do not interrupt the update process

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-31226 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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