usb: xhci: Fix isochronous Ring Underrun/Overrun event handling

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix isochronous Ring Underrun/Overrun event handling The TRB pointer of these events points at enqueue at the time of error occurrence on xHCI 1.1+ HCs or it's NULL on older ones. By the time we are handling the event, a new TD may be queued at this ring position. I can trigger this race by rising interrupt moderation to increase IRQ handling delay. Similar delay may occur naturally due to system load. If this ever happens after a Missed Service Error, missed TDs will be skipped and the new TD processed as if it matched the event. It could be given back prematurely, risking data loss or buffer UAF by the xHC. Don't complete TDs on xrun events and don't warn if queued TDs don't match the event's TRB pointer, which can be NULL or a link/no-op TRB. Don't warn if there are no queued TDs at all. Now that it's safe, also handle xrun events if the skip flag is clear. This ensures completion of any TD stuck in 'error mid TD' state right before the xrun event, which could happen if a driver submits a finite number of URBs to a buggy HC and then an error occurs on the last TD.

Timeline

1. May 9, 2025, 6:45 AM UTCCVE published
2. Oct 15, 2026, 9:45 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 15, 2026, 9:52 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 608b973b70f87e9a9bafbfdfa16aab68507aef45 · fixed in 16a7a8e6c47fea5c847beb696c8c21a7a44c1915; From 608b973b70f87e9a9bafbfdfa16aab68507aef45 · fixed in 39a080a2925c81b0f1da0add44722ef2b78e5454; From 608b973b70f87e9a9bafbfdfa16aab68507aef45 · fixed in 906dec15b9b321b546fd31a3c99ffc13724c7af4

• Linux Linux

  6.10

• KernelLinux

  From 6.10.0 · fixed in 6.12.26; From 6.13.0 · fixed in 6.14.5

References 3