# CVE-2023-40238: Integer overflow in n/a

> Attackers can execute arbitrary code during UEFI boot via crafted BMP files exploiting an integer signedness error in Lenovo devices.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Dec 2023
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-5rp3-83j5-w2g4

## What is CVE-2023-40238?

CVE-2023-40238 is a medium-severity vulnerability in Insyde Insydeh2o, published on 7 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A LogoFAIL issue was discovered in BmpDecoderDxe in Insyde InsydeH2O with kernel 5.2 before 05.28.47, 5.3 before 05.37.47, 5.4 before 05.45.47, 5.5 before 05.53.47, and 5.6 before 05.60.47 for certain Lenovo devices. Image parsing of crafted BMP logo files can copy data to a specific address during the DXE phase of UEFI execution. This occurs because of an integer signedness error involving PixelHeight and PixelWidth during RLE4/RLE8 compression.

Weakness: CWE-312 (Cleartext Storage of Sensitive Information)

## Which versions are affected by CVE-2023-40238?

It affects 187 products.


Products: Fujitsu Celsius C780 Firmware, Fujitsu Celsius H5511 Firmware, Fujitsu Celsius H7510 Firmware, Fujitsu Celsius H7613 Firmware, Fujitsu Celsius H780 Firmware, Fujitsu Celsius H980 Firmware, Fujitsu Celsius J5010 Firmware, Fujitsu Celsius J550\/2 Firmware, Fujitsu Celsius J580 Firmware, Fujitsu Celsius M7010 Firmware, Fujitsu Celsius M7010power Firmware, Fujitsu Celsius M7010x Firmware, Fujitsu Celsius M7010xpower Firmware, Fujitsu Celsius R970 Firmware, Fujitsu Celsius R970b Firmware, Fujitsu Celsius R970bpower Firmware, Fujitsu Celsius W5010\/L Firmware, Fujitsu Celsius W5010 Firmware, Fujitsu Celsius W5011 Firmware, Fujitsu Celsius W5012-Ll Firmware and 167 more.

## How do I fix CVE-2023-40238?

No fix has been published for CVE-2023-40238 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-40238 being exploited?

There is no known exploitation of CVE-2023-40238 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-40238 and fix it if it is affected.

What it is: CVE-2023-40238 is a medium-severity vulnerability in Insyde Insydeh2o, published on 7 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-40238 in the wild and no public exploit code.

Affected product: Insyde Insydeh2o. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-40238/ (Markdown: https://insights.sbomify.com/CVE-2023-40238/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-40238
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-40238
- OSV: https://osv.dev/vulnerability/CVE-2023-40238

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-40238/
Summaries are generated and may contain mistakes; the official description above is the record.