thunderbolt: Fix NULL dereference in tb_remove_work()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98688
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 NULL dereference in tb_remove_work() There is a slight race between tb_remove_work() and tb_domain_remove() which leads to dereferencing a NULL tb->root_switch pointer inside tb_free_unplugged_xdomains(): Thread A Thread B tb_remove_work() tb_domain_remove() mutex_lock(&tb->lock) tb_stop() /* doesn't cancel a running callback */ cancel_delayed_work(&tcm->remove_work) ... tb_switch_remove(tb->root_switch) tb->root_switch = NULL mutex_unlock(&tb->lock) mutex_lock(&tb->lock) ... /* without checking ->root_switch */ tb_free_unplugged_xdomains(tb->root_switch) mutex_unlock(&tb->lock) Commit a8937f35cf39 ("thunderbolt: Remove XDomain from the bus without holding tb->lock") doesn't seem right to move tb_free_unplugged_xdomains() out of the &tb->lock section and the check for tb->root_switch, in particular. It states: For this reason separate removing the XDomain from the topology data structures (where we need the lock) from unregistering the device from the bus (where remove callbacks of the drivers are being called). tb_free_unplugged_xdomains() belongs to the former group of functions requiring the lock. And it also calls tb_xdomain_remove() which should only be called with &tb->lock held. Found by Linux Verification Center (linuxtesting.org) with Svace static analysis tool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a8937f35cf39c39c64325aa84d0463d866850857 2f4cd43faa9d6470b30a9fbcbac6584db8108c1f git Not specified
CNA Linux Linux affected a8937f35cf39c39c64325aa84d0463d866850857 4310c6b8e75d6a47f7548e5948fbe6318aa4440a git Not specified
CNA Linux Linux affected 3e9e823810b9a51f0bee9ed6e3d90df70484ff8d git Not specified
CNA Linux Linux affected 9363cd4977260bf7f211feee54f85858bba2320c git Not specified
CNA Linux Linux affected 5.10.266 5.11 semver Not specified
CNA Linux Linux affected 5.15.217 5.16 semver Not specified
CNA Linux Linux affected 7.2 Not specified
CNA Linux Linux unaffected 7.2 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/2f4cd43faa9d6470b30a9fbcbac6584db8108c1f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4310c6b8e75d6a47f7548e5948fbe6318aa4440a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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