Bug 2532239 (CVE-2026-89737) - CVE-2026-89737 kernel: usb: typec: thunderbolt: Disable work before freeing tbt on remove
Summary: CVE-2026-89737 kernel: usb: typec: thunderbolt: Disable work before freeing t...
Keywords:
Status: NEW
Alias: CVE-2026-89737
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-11 21:37 UTC by OSIDB Bzimport
Modified: 2026-09-21 16:15 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-09-11 21:37:24 UTC
In the Linux kernel, the following vulnerability has been resolved:

usb: typec: thunderbolt: Disable work before freeing tbt on remove

tbt_altmode_remove() drops the plug and cable references without
draining tbt->work. The work function dereferences those references,
and can also requeue itself in its error path. The VDM callbacks can
queue the same work item.

Disable and drain tbt->work before dropping the references. This waits
for an existing invocation and prevents subsequent schedule_work()
calls from queueing it during teardown.

This issue was found by an in-house static analysis tool and confirmed
by manual code review.


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