CVE-2026-80989High· 8.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Mark the connection down when bringing it up fails Every failure path in tbnet_connected_work() undoes its own work and returns without clearing logi…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.3
none → medium
— → 5.3
none → medium
— → 8.8
none → high
8.8 → 5.3
high → medium
8.8 → 7
0.2% → 0.4%
7 → 8.8
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
net: thunderbolt: Mark the connection down when bringing it up fails
Every failure path in tbnet_connected_work() undoes its own work and returns without clearing login_sent, so the connection still looks established. The next tbnet_tear_down() therefore takes its main branch and repeats a teardown that already happened: it stops rings that are already stopped, which is a dev_WARN() and fatal under panic_on_warn, and it releases net->remote_transmit_path even on the HopID mismatch path, where this connection never owned that id, silently freeing one that someone else is still using.
Clear login_sent on those paths. That is enough for tbnet_tear_down() to leave the unwound state alone, and login_received has to stay set: it records that the peer has logged in and carries the transmit path it gave us, which nothing on this side can make the peer send again. Two things change beyond keeping the teardown out of the way: the logout request in that block is no longer sent, and the peer's next login request now re-queues our login work rather than connected_work, giving the connection a fresh login instead of a retry on stale state.
Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < e0d4a17afde5aa0045dc3e1d66c6bb80927bad8cLinux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < ed1d6e3d735e7b03f43a02f4306c89eb7663da14Linux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < f01e6a35c440b62f060e21f36b385e574a7f308cLinux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < d6c0af293129345a17dc31c9b4179dc7f3d6af7aLinux >= e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e < 3c8b26ebf525ba5960510f48c6e9936a79ebe76fLinux 4.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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