CVE-2026-98692

/// Technical 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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References