# CVE-2021-1958: Use after free in Snapdragon Auto, Snapdragon Connectivity, Snapdragon Mobile, Snapdragon Wearables

> A race condition in the Qualcomm fastrpc kernel driver allows attackers to trigger a use-after-free, potentially leading to code execution or privilege escalation on Snapdragon devices.

- **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:** 9 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** 2669288, A-181676968, GHSA-j6hv-997g-w46w, PUB-A-181676968

## What is CVE-2021-1958?

CVE-2021-1958 is a medium-severity use after free vulnerability in Qualcomm Qca6574a Firmware, published on 9 Sep 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A race condition in fastrpc kernel driver for dynamic process creation can lead to use after free scenario in Snapdragon Auto, Snapdragon Connectivity, Snapdragon Mobile, Snapdragon Wearables

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2021-1958?

It affects 38 products.


Products: Qualcomm Qca6574a Firmware, Qualcomm Qca6574au Firmware, Qualcomm Qca6595 Firmware, Qualcomm Qca6595au Firmware, Qualcomm Qca6696 Firmware, Qualcomm Sa6145p Firmware, Qualcomm Sa6150p Firmware, Qualcomm Sa6155p Firmware, Qualcomm Sa8145p Firmware, Qualcomm Sa8150p Firmware, Qualcomm Sa8155 Firmware, Qualcomm Sa8155p Firmware, Qualcomm Sa8195p Firmware, Qualcomm Sd480 Firmware, Qualcomm Sd778g Firmware, Qualcomm Sd780g Firmware, Qualcomm Sd888 5g Firmware, Qualcomm Sda429w Firmware, Qualcomm Sm7325 Firmware, Qualcomm Wcd9341 Firmware and 18 more.

## How do I fix CVE-2021-1958?

Apply the vendor's patch.

## Is CVE-2021-1958 being exploited?

There is no known exploitation of CVE-2021-1958 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1958 and fix it if it is affected.

What it is: CVE-2021-1958 is a medium-severity use after free vulnerability in Qualcomm Qca6574a Firmware, published on 9 Sep 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-2021-1958 in the wild and no public exploit code.

Affected product: Qualcomm Qca6574a 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-2021-1958/ (Markdown: https://insights.sbomify.com/CVE-2021-1958/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1958
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1958
- OSV: https://osv.dev/vulnerability/CVE-2021-1958

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-1958/
Summaries are generated and may contain mistakes; the official description above is the record.