# CVE-2022-40540: Buffer copy without checking the size of input in Linux Kernel

> A buffer overflow in the Linux kernel firmware loader allows attackers to execute arbitrary code or escalate privileges on Android devices.

- **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:** 7 Mar 2023
- **Updated:** 3 Aug 2024
- **Also known as:** 3280498, A-261470730, ASB-A-261470730, GHSA-58jw-58x8-342p

## What is CVE-2022-40540?

CVE-2022-40540 is a high-severity memory corruption vulnerability in Qualcomm Sd888 5g Firmware, published on 7 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Memory corruption due to buffer copy without checking the size of input while loading firmware in Linux Kernel.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2022-40540?

It affects 16 products.


Products: Qualcomm Sd888 5g Firmware, Qualcomm Sd 8 Gen1 5g Firmware, Qualcomm Sw5100 Firmware, Qualcomm Sw5100p Firmware, Qualcomm Wcd9380 Firmware, Qualcomm Wcd9385 Firmware, Qualcomm Wcn3980 Firmware, Qualcomm Wcn3988 Firmware, Qualcomm Wcn6850 Firmware, Qualcomm Wcn6851 Firmware, Qualcomm Wcn6855 Firmware, Qualcomm Wcn6856 Firmware, Qualcomm Wcn7850 Firmware, Qualcomm Wcn7851 Firmware, Qualcomm Wsa8830 Firmware, Qualcomm Wsa8835 Firmware.

## How do I fix CVE-2022-40540?

Apply the vendor's patch.

## Is CVE-2022-40540 being exploited?

There is no known exploitation of CVE-2022-40540 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Sd888 5g Firmware

- [CVE-2022-25708](https://insights.sbomify.com/CVE-2022-25708/): Memory corruption in Snapdragon Connectivity, Snapdragon Mobile (critical 9.8)
- [CVE-2022-25716](https://insights.sbomify.com/CVE-2022-25716/): Time-of-check Time-of-use Race Condition in Multimedia Framework (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-40540 and fix it if it is affected.

What it is: CVE-2022-40540 is a high-severity memory corruption vulnerability in Qualcomm Sd888 5g Firmware, published on 7 Mar 2023. 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-2022-40540 in the wild and no public exploit code.

Affected product: Qualcomm Sd888 5g 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-2022-40540/ (Markdown: https://insights.sbomify.com/CVE-2022-40540/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-40540
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-40540
- OSV: https://osv.dev/vulnerability/CVE-2022-40540

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-40540/
Summaries are generated and may contain mistakes; the official description above is the record.