thunderbolt: Prevent XDomain delayed work use-after-free on disconnect

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74575
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:03 UTC
Updated2026-08-15 13:18:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: thunderbolt: Prevent XDomain delayed work use-after-free on disconnect tb_xdp_handle_request() runs on system_wq and queues xd->state_work via queue_delayed_work() in three request handlers: PROPERTIES_CHANGED_REQUEST, UUID_REQUEST (via start_handshake), and LINK_STATE_CHANGE_REQUEST. Similarly, update_xdomain() queues xd->properties_changed_work when local properties change. Concurrently, tb_xdomain_remove() calls stop_handshake() which does cancel_delayed_work_sync() on both delayed works. Later, tb_xdomain_unregister() calls device_unregister() which eventually frees the xdomain. Since commit 559c1e1e0134 ("thunderbolt: Run tb_xdp_handle_request() in system workqueue") moved the request handler off tb->wq, the handler and the remove path are no longer serialized. If queue_delayed_work() executes after cancel_delayed_work_sync() but before the xdomain is freed, the delayed work fires on a freed object. Add xd->removing that tb_xdomain_remove() sets under xd->lock before calling stop_handshake(). Each external queue site holds the same lock and checks removing before calling queue_delayed_work(). This provides the mutual exclusion needed: either the queue site acquires the lock first and queues work that the subsequent cancel will see, or the remove path acquires the lock first and the queue site observes removing == true and skips the queue.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 559c1e1e013437bf190469efbcbd8bc803285853 91b40862a02000f490b63f1d315be3ee31e83871 git Not specified
CNA Linux Linux affected 559c1e1e013437bf190469efbcbd8bc803285853 33c0ee18cf8665c974b00f4e0ba769fbc07efe10 git Not specified
CNA Linux Linux affected 559c1e1e013437bf190469efbcbd8bc803285853 54a62153c765cd24239cde1f2633f2a2fd005368 git Not specified
CNA Linux Linux affected 559c1e1e013437bf190469efbcbd8bc803285853 2aa2cde2cc79a79d8ea4a15be9f4a67fc528ae91 git Not specified
CNA Linux Linux affected 559c1e1e013437bf190469efbcbd8bc803285853 2c5d2d3c3f70cde2565d7b279b544893a2035842 git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/54a62153c765cd24239cde1f2633f2a2fd005368 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c5d2d3c3f70cde2565d7b279b544893a2035842 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/91b40862a02000f490b63f1d315be3ee31e83871 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33c0ee18cf8665c974b00f4e0ba769fbc07efe10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2aa2cde2cc79a79d8ea4a15be9f4a67fc528ae91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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