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CVE-2026-98693

thunderbolt: Hold a router reference for each allocated HopID

Description

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Hold a router reference for each allocated HopID tb_stop() drops the reference to all DP tunnels but does not deactivate them, thus nothing cancels a dprx_work still in flight (which holds its own tunnel reference) and the tunnel can outlive tb_switch_remove(). The HopID releases in tb_path_free() then operate on freed IDAs and trigger warnings like ida_free called for id=8 which is not allocated. This can be triggered by unbinding the driver while a DP tunnel is still waiting for the DPRX capabilities read to finish. On the Apple NHI unplugging the cable runs into just that reliably because the read can never finish right now and because the unplug powers down the entire USB4 complex and removes the NHI device. Take a router reference whenever an input or output HopID is allocated and drop it again after the HopID is released. This keeps the ports and their HopID IDAs alive for as long as they are used. The KUnit tests allocate routers without ever registering their devices so initialize the embedded struct device there as well and drop its initial reference when the test is finished.

Timeline

  1. ID reserved

    By Linux

  2. · 23 days later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)
0.20% · top 90% of all CVEs (10 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 – < c444d2c17dc236680324fd989232199680a6c419
    • affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 – < 2b5f976119d8f099a03cbf700df3d9c8690fe33d
    • affected d6d458d42e1e1544a18f37f1d5c840e00d5261b9 – < 032c59c7681c661b63123231824170c025afb7e7
  • Linux · Linux

    • affected 6.14
    • unaffected < 6.14
    • unaffected 6.18.56 – ≤ 6.18.*
    • unaffected 7.2.10 – ≤ 7.2.*
    • unaffected 7.3 – ≤ *

References

3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .