# CVE-2024-42040: Information disclosure in n/a

> An attacker on the local network can leak up to 32 bytes of memory from U-Boot via crafted DHCP responses, potentially exposing sensitive data.

- **Severity:** High 8.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Aug 2024
- **Updated:** 20 Nov 2024
- **Also known as:** DEBIAN-CVE-2024-42040, GHSA-xh96-vq46-m9ww, OESA-2026-1971, UBUNTU-CVE-2024-42040

## What is CVE-2024-42040?

CVE-2024-42040 is a high-severity vulnerability in n/a, published on 23 Aug 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Buffer Overflow vulnerability in the net/bootp.c in DENEX U-Boot from its initial commit in 2002 (3861aa5) up to today on any platform allows an attacker on the local network to leak memory from four up to 32 bytes of memory stored behind the packet to the network depending on the later use of DHCP-provided parameters via crafted DHCP responses.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2024-42040?

It affects 1 product.


Products: Denx U-Boot.

## How do I fix CVE-2024-42040?

Apply the vendor's patch.

## Is CVE-2024-42040 being exploited?

There is no known exploitation of CVE-2024-42040 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-34835](https://insights.sbomify.com/CVE-2022-34835/): Integer overflow in n/a (critical 9.8)
- [CVE-2022-30767](https://insights.sbomify.com/CVE-2022-30767/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-8432](https://insights.sbomify.com/CVE-2020-8432/): Use after free in n/a (critical 9.8)
- [CVE-2019-14192](https://insights.sbomify.com/CVE-2019-14192/): Integer overflow in n/a (critical 9.8)
- [CVE-2019-14193](https://insights.sbomify.com/CVE-2019-14193/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-42040 and fix it if it is affected.

What it is: CVE-2024-42040 is a high-severity vulnerability in n/a, published on 23 Aug 2024. 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-2024-42040 in the wild and no public exploit code.

Affected product: n/a. 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-2024-42040/ (Markdown: https://insights.sbomify.com/CVE-2024-42040/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-42040
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-42040
- OSV: https://osv.dev/vulnerability/CVE-2024-42040

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-42040/
Summaries are generated and may contain mistakes; the official description above is the record.