# CVE-2025-38391: usb: typec: altmodes/displayport: do not index invalid pin_assignments

> A malicious USB DisplayPort partner can trigger a kernel crash via out-of-bounds array access in the Type-C driver, requiring a kernel patch.

- **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:** Yes
- **Published:** 25 Jul 2025
- **Updated:** 11 May 2026
- **Also known as:** AZL-65687, AZL-73007, BELL-CVE-2025-38391, DEBIAN-CVE-2025-38391, GHSA-f462-4c2j-6qcw, ROOT-OS-DEBIAN-11-CVE-2025-38391, ROOT-OS-DEBIAN-12-CVE-2025-38391, ROOT-OS-UBUNTU-2204-CVE-2025-38391, ROOT-OS-UBUNTU-2404-CVE-2025-38391, UBUNTU-CVE-2025-38391

## What is CVE-2025-38391?

CVE-2025-38391 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 25 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

usb: typec: altmodes/displayport: do not index invalid pin_assignments

A poorly implemented DisplayPort Alt Mode port partner can indicate
that its pin assignment capabilities are greater than the maximum
value, DP_PIN_ASSIGN_F. In this case, calls to pin_assignment_show
will cause a BRK exception due to an out of bounds array access.

Prevent for loop in pin_assignment_show from accessing
invalid values in pin_assignments by adding DP_PIN_ASSIGN_MAX
value in typec_dp.h and using i < DP_PIN_ASSIGN_MAX as a loop
condition.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2025-38391?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2025-38391?

Apply the vendor's patch.

## Is CVE-2025-38391 being exploited?

There is no known exploitation of CVE-2025-38391 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-2025-38391 and fix it if it is affected.

What it is: CVE-2025-38391 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 25 Jul 2025. 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-2025-38391 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-2025-38391/ (Markdown: https://insights.sbomify.com/CVE-2025-38391/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-38391
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-38391
- OSV: https://osv.dev/vulnerability/CVE-2025-38391

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-38391/
Summaries are generated and may contain mistakes; the official description above is the record.