dbcve.org
Thinkbook 14 Iml FirmwareOperating system · Lenovo

CVE-2022-1890

HIGH · 7.8 CVSS v3.1 Published 2023-01-26
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
80/100
Remediation priority · High
Zero-click

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
A buffer overflow in the ReadyBootDxe driver in some Lenovo Notebook products may allow an attacker with local privileges to execute arbitrary code.

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 · moderate confidence

A buffer overflow vulnerability exists in the ReadyBootDxe UEFI driver on certain Lenovo notebook models. The flaw allows a local attacker with existing privileges to execute arbitrary code by overflowing a buffer in the driver.

MitigationApply the Lenovo BIOS/firmware update provided for affected notebook models. This is a vendor-supplied patch that must be obtained from Lenovo and deployed to vulnerable systems.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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
Thinkbook 14 Iml FirmwareOperating system
Affected:< cjcn38ww
Thinkbook 14 Iil FirmwareOperating system
Affected:< djcn28ww
Thinkbook 15 Iil FirmwareOperating system
Affected:< djcn28ww
Thinkbook 15 Iml FirmwareOperating system
Affected:< cjcn38ww
Yoga C640 13iml Lte FirmwareOperating system
Affected:< chcn28ww
Yoga C640 13iml FirmwareOperating system
Affected:< chcn28ww

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the exact Lenovo model
    Run 'dmidecode -s system-product-name' or check the physical product label to confirm the system is a Thinkbook 14 IML, Thinkbook 14 IIL, Thinkbook 15 IIL, Thinkbook 15 IML, Yoga C640 13IML LTE, or Yoga C640 13IML.
    Affected if The model does not match any of the listed affected models.
  2. Check the current BIOS/firmware version
    Run 'dmidecode -s bios-version' on Linux, or check the BIOS/UEFI setup utility under the 'Information' or 'Advanced' tab, or use Lenovo Vantage/System Update to view the firmware version.
    Affected if Unable to retrieve the firmware version.
  3. Compare version against vulnerable thresholds
    Compare your retrieved firmware version number to the vulnerable versions: Thinkbook 14 IML < cjcn38ww, Thinkbook 14/15 IIL < djcn38ww, Thinkbook 15 IML < cjcn38ww, Yoga C640 13IML (all variants) < chcn28ww.
    Affected if Your installed version is lower than the version threshold for your specific model.
  4. Confirm ReadyBootDxe driver presence
    Check UEFI/BIOS settings for ReadyBoot or Fast Boot features. This driver is part of the UEFI firmware and handles pre-boot optimization. Inspect via 'efibootmgr -v' on Linux or check the BIOS Boot settings.
    Affected if ReadyBoot or fast boot features are not present in your system firmware.

You are affected if your system is one of the listed Lenovo models and your current BIOS/firmware version is lower than the version threshold for that model.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the Lenovo BIOS/firmware update provided for affected notebook models. This is a vendor-supplied patch that must be obtained from Lenovo and deployed to vulnerable systems.

Recommended fix High confidence

Thinkbook 14 IML: cjcn38ww | Thinkbook 14 IIL: djcn28ww | Thinkbook 15 IIL: djcn28ww | Thinkbook 15 IML: cjcn38ww | Yoga C640 13IML LTE: chcn28ww | Yoga C640 13IML: chcn28ww

  1. Identify the exact model number of the Lenovo notebook (e.g., Thinkbook 14 IML, Thinkbook 15 IIL, Yoga C640 13IML)
  2. Navigate to the official Lenovo support website at support.lenovo.com
  3. Enter the specific model number in the search bar to locate the product support page
  4. Locate the 'Driver & Downloads' or 'BIOS' section for firmware updates
  5. Identify the current firmware version installed on the system (via BIOS setup or Lenovo Vantage)
  6. Download the firmware update: for Thinkbook 14/15 IML use version cjcn38ww or later, for Thinkbook 14/15 IIL use version djcn28ww or later, for Yoga C640 13IML (both LTE and non-LTE) use version chcn28ww or later
  7. Review all warnings and ensure the laptop is connected to AC power and not battery only
  8. Execute the downloaded firmware update utility and follow the on-screen prompts
Caveat Firmware updates carry inherent risk if interrupted; ensure stable power and do not shut down during the flash process

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

Fix this in Thinkbook 14 Iml Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2022-1890 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data