thunderbolt: Make the DP tunnel activation callback mandatory

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98692
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:22 UTC
Updated2026-10-19 10:19:33 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 47d60ea801fc333a10c576691eca2e7840b02d3d git Not specified
CNA Linux Linux affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 12f5d8b85a66a0ac08d082517d92ce136f8c0d42 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/12f5d8b85a66a0ac08d082517d92ce136f8c0d42 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/47d60ea801fc333a10c576691eca2e7840b02d3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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