# CVE-2022-39842: Integer overflow in n/a

> Integer overflow in the pxa3xx_gcu driver allows heap overflow, potentially leading to code execution or privilege escalation in the Linux kernel.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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:** Yes
- **Published:** 5 Sep 2022
- **Updated:** 3 Aug 2024
- **Also known as:** A-245928838, ASB-A-245928838, AZL-10861, DEBIAN-CVE-2022-39842, GHSA-8cq9-p78m-67v8, UBUNTU-CVE-2022-39842

## What is CVE-2022-39842?

CVE-2022-39842 is a medium-severity vulnerability in Debian Debian Linux, published on 5 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2022-39842?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2022-39842?

Apply the vendor's patch.

## Is CVE-2022-39842 being exploited?

There is no known exploitation of CVE-2022-39842 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-39842 and fix it if it is affected.

What it is: CVE-2022-39842 is a medium-severity vulnerability in Debian Debian Linux, published on 5 Sep 2022. 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-2022-39842 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2022-39842/ (Markdown: https://insights.sbomify.com/CVE-2022-39842/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-39842
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-39842
- OSV: https://osv.dev/vulnerability/CVE-2022-39842

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-39842/
Summaries are generated and may contain mistakes; the official description above is the record.