# CVE-2025-21485: Time-of-check Time-of-use (TOCTOU) Race Condition in DSP Service

> A race condition in Qualcomm Snapdragon DSP allows memory corruption and potential code execution via malicious IOCTL calls.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 3 Jun 2025
- **Updated:** 26 Feb 2026
- **Also known as:** 3947112, A-409047090, ASB-A-409047090, GHSA-w5w3-37x5-78hg

## What is CVE-2025-21485?

CVE-2025-21485 is a high-severity vulnerability in Qualcomm Fastconnect 6900 Firmware, published on 3 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Memory corruption while processing INIT and multimode invoke IOCTL calls on FastRPC.

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2025-21485?

It affects 29 products.


Products: Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Qmp1000 Firmware, Qualcomm Sm8735 Firmware, Qualcomm Sm8750 Firmware, Qualcomm Sm8750p Firmware, Qualcomm Snapdragon 8 Gen 3 Mobile Platform Firmware, Qualcomm Snapdragon W5\+ Gen 1 Wearable Platform Firmware, Qualcomm Sw5100 Firmware, Qualcomm Sw5100p Firmware, Qualcomm Sxr2230p Firmware, Qualcomm Sxr2250p Firmware, Qualcomm Sxr2330p Firmware, Qualcomm Wcd9378 Firmware, Qualcomm Wcd9380 Firmware, Qualcomm Wcd9385 Firmware, Qualcomm Wcd9390 Firmware, Qualcomm Wcd9395 Firmware, Qualcomm Wcn7750 Firmware, Qualcomm Wcn7860 Firmware and 9 more.

## How do I fix CVE-2025-21485?

Apply the vendor's patch.

## Is CVE-2025-21485 being exploited?

There is no known exploitation of CVE-2025-21485 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Fastconnect 6900 Firmware

- [CVE-2024-38399](https://insights.sbomify.com/CVE-2024-38399/): Use After Free in Graphics (high 8.4)
- [CVE-2024-21472](https://insights.sbomify.com/CVE-2024-21472/): Use After Free in Kernel (high 8.4)
- [CVE-2025-47405](https://insights.sbomify.com/CVE-2025-47405/): Untrusted Pointer Dereference in Camera (high 7.8)
- [CVE-2025-47358](https://insights.sbomify.com/CVE-2025-47358/): Use After Free in Secure Processor (high 7.8)
- [CVE-2025-47350](https://insights.sbomify.com/CVE-2025-47350/): Use After Free in DSP Service (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-21485 and fix it if it is affected.

What it is: CVE-2025-21485 is a high-severity vulnerability in Qualcomm Fastconnect 6900 Firmware, published on 3 Jun 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-2025-21485 in the wild and no public exploit code.

Affected product: Qualcomm Fastconnect 6900 Firmware. 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-2025-21485/ (Markdown: https://insights.sbomify.com/CVE-2025-21485/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21485
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21485
- OSV: https://osv.dev/vulnerability/CVE-2025-21485

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21485/
Summaries are generated and may contain mistakes; the official description above is the record.