CVE-2025-37882

/// Technical description

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

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References