thunderbolt: Fix domain reference leak when DPRX read is canceled

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Summary

CVECVE-2026-98690
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: Fix domain reference leak when DPRX read is canceled tb_tunnel_one_dp() takes a domain reference which is only dropped once tb_dp_tunnel_active() has run on the work queue. If that work is cancelled that reference is leaked. Since commit f5cc545f5969 ("thunderbolt: Wait for tb_domain_release() to complete when driver is removed") instead of just leaking memory this now also blocks in the completion wait forever when unbinding the driver. This can be triggered whenever a DP tunnel is torn down before the DPRX read has completed, e.g. by unplugging within the timeout, and then unbinding the driver. That reference only exists to keep the domain around while the DPRX work is scheduled so let the work itself own it: take it in tb_dp_dprx_start() and drop it in both places that end the work. Get/put are then paired inside the same file and it doesn't matter anymore if the callback ever runs.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 2f5893172fc6153f5f1ef34014ddbfcbf1f47f29 git Not specified
CNA Linux Linux affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 7739b02129b2248f9a8054cfda924fa253f66a88 git Not specified
CNA Linux Linux affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 1fd1f67c94d30889377bba774f032ec15e8b9299 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* 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/2f5893172fc6153f5f1ef34014ddbfcbf1f47f29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1fd1f67c94d30889377bba774f032ec15e8b9299 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7739b02129b2248f9a8054cfda924fa253f66a88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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