# CVE-2021-42327: Memory corruption in n/a

> A heap-based buffer overflow in the Linux kernel AMD GPU driver allows local attackers to execute arbitrary code or escalate privileges via the debug filesystem.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Oct 2021
- **Updated:** 4 Aug 2024
- **Also known as:** AZL-6600, DEBIAN-CVE-2021-42327, GHSA-h79r-2wv4-r9g8, UBUNTU-CVE-2021-42327

## What is CVE-2021-42327?

CVE-2021-42327 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 21 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

dp_link_settings_write in drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c in the Linux kernel through 5.14.14 allows a heap-based buffer overflow by an attacker who can write a string to the AMD GPU display drivers debug filesystem. There are no checks on size within parse_write_buffer_into_params when it uses the size of copy_from_user to copy a userspace buffer into a 40-byte heap buffer.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2021-42327?

It affects 10 products.


Products: Fedoraproject Fedora, Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware, Netapp H500s Firmware, Netapp H700e Firmware, Netapp H700s Firmware.

## How do I fix CVE-2021-42327?

Apply the vendor's patch.

## Is CVE-2021-42327 being exploited?

There is no known exploitation of CVE-2021-42327 in the wild and no public exploit code.

Public exploit code:

-  kernel exploit POC for vulnerability i found in amd gpu driver (github_poc): https://github.com/docfate111/CVE-2021-42327

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42327 and fix it if it is affected.

What it is: CVE-2021-42327 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 21 Oct 2021. 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-2021-42327 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2021-42327/ (Markdown: https://insights.sbomify.com/CVE-2021-42327/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42327
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42327
- OSV: https://osv.dev/vulnerability/CVE-2021-42327

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42327/
Summaries are generated and may contain mistakes; the official description above is the record.