# CVE-2021-35095: Race condition in Snapdragon Connectivity, Snapdragon Mobile

> A race condition in Qualcomm Snapdragon message queue registration allows multiple clients to share labels, potentially enabling privilege escalation or code execution.

- **Severity:** High 8.4 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jun 2022
- **Updated:** 4 Aug 2024
- **Also known as:** 2996895, A-204905206, ASB-A-204905206, GHSA-7vc8-hf39-6395

## What is CVE-2021-35095?

CVE-2021-35095 is a high-severity vulnerability in Qualcomm Ar8035 Firmware, published on 14 Jun 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper serialization of message queue client registration can lead to race condition allowing multiple gunyah message clients to register with same label in Snapdragon Connectivity, Snapdragon Mobile

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2021-35095?

It affects 10 products.


Products: Qualcomm Ar8035 Firmware, Qualcomm Qca8081 Firmware, Qualcomm Qca8337 Firmware, Qualcomm Sd 8 Gen1 5g Firmware, Qualcomm Sdx65 Firmware, Qualcomm Wcd9380 Firmware, Qualcomm Wcn6855 Firmware, Qualcomm Wcn6856 Firmware, Qualcomm Wsa8830 Firmware, Qualcomm Wsa8835 Firmware.

## How do I fix CVE-2021-35095?

Apply the vendor's patch.

## Is CVE-2021-35095 being exploited?

There is no known exploitation of CVE-2021-35095 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Ar8035 Firmware

- [CVE-2023-33106](https://insights.sbomify.com/CVE-2023-33106/): Qualcomm Multiple Chipsets Use of Out-of-Range Pointer Offset (high 8.4, exploited in the wild)
- [CVE-2024-45569](https://insights.sbomify.com/CVE-2024-45569/): Improper Validation of Array Index in WLAN Host Communication (critical 9.8)
- [CVE-2024-21473](https://insights.sbomify.com/CVE-2024-21473/): Improper Input Validation in WIN SON (critical 9.8)
- [CVE-2023-28582](https://insights.sbomify.com/CVE-2023-28582/): Buffer Copy Without Checking Size of Input in Data Modem (critical 9.8)
- [CVE-2023-43552](https://insights.sbomify.com/CVE-2023-43552/): Use After Free in WLAN Host Communication (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-35095 and fix it if it is affected.

What it is: CVE-2021-35095 is a high-severity vulnerability in Qualcomm Ar8035 Firmware, published on 14 Jun 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-2021-35095 in the wild and no public exploit code.

Affected product: Qualcomm Ar8035 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-2021-35095/ (Markdown: https://insights.sbomify.com/CVE-2021-35095/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-35095
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-35095
- OSV: https://osv.dev/vulnerability/CVE-2021-35095

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-35095/
Summaries are generated and may contain mistakes; the official description above is the record.