# CVE-2025-21436: Use After Free in DSP Service

> Concurrent IOCTL calls in the DSP service can trigger a use-after-free, potentially allowing attackers to execute code or escalate privileges on Android devices.

- **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:** 7 Apr 2025
- **Updated:** 26 Feb 2026
- **Also known as:** 3927062, A-388048322, ASB-A-388048322, GHSA-v97v-vwrw-5r2q

## What is CVE-2025-21436?

CVE-2025-21436 is a high-severity use after free vulnerability in Qualcomm Fastconnect 7800 Firmware, published on 7 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Memory corruption may occur while initiating two IOCTL calls simultaneously to create processes from two different threads.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2025-21436?

It affects 25 products.


Products: 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 Sxr2330p Firmware, Qualcomm Wcd9378 Firmware, Qualcomm Wcd9380 Firmware, Qualcomm Wcd9390 Firmware, Qualcomm Wcd9395 Firmware, Qualcomm Wcn7750 Firmware, Qualcomm Wcn7860 Firmware, Qualcomm Wcn7861 Firmware, Qualcomm Wcn7880 Firmware, Qualcomm Wcn7881 Firmware, Qualcomm Wsa8830 Firmware and 5 more.

## How do I fix CVE-2025-21436?

Apply the vendor's patch.

## Is CVE-2025-21436 being exploited?

There is no known exploitation of CVE-2025-21436 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Fastconnect 7800 Firmware

- [CVE-2024-23365](https://insights.sbomify.com/CVE-2024-23365/): Use After Free in SCE-Mink (high 8.4)
- [CVE-2025-47380](https://insights.sbomify.com/CVE-2025-47380/): Untrusted Pointer Dereference in Camera (high 7.8)
- [CVE-2025-47352](https://insights.sbomify.com/CVE-2025-47352/): Improper Validation of Array Index in Audio (high 7.8)
- [CVE-2025-47329](https://insights.sbomify.com/CVE-2025-47329/): Release of Invalid Pointer or Reference in Android Core (high 7.8)
- [CVE-2025-27056](https://insights.sbomify.com/CVE-2025-27056/): Use After Free in DSP Service (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-21436 and fix it if it is affected.

What it is: CVE-2025-21436 is a high-severity use after free vulnerability in Qualcomm Fastconnect 7800 Firmware, published on 7 Apr 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-2025-21436 in the wild and no public exploit code.

Affected product: Qualcomm Fastconnect 7800 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-2025-21436/ (Markdown: https://insights.sbomify.com/CVE-2025-21436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21436
- OSV: https://osv.dev/vulnerability/CVE-2025-21436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21436/
Summaries are generated and may contain mistakes; the official description above is the record.