CVE-2025-37882
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In the Linux kernel, a vulnerability in the USB xHCI driver related to handling of isochronous Ring Underrun/Overrun events was found. The TRB pointer in these events may point to the enqueue position at error time or be NULL, and with delayed processing, a new TD may be incorrectly processed, leading to data loss or a use-after-free of the buffer by the xHC.
Risk Assessment
The organization faces risk of data loss or memory corruption (UAF) during isochronous transfer errors, especially under high system load or with interrupt moderation enabled.
Recommendation
Immediately update the Linux kernel to a version containing the fix, which prevents completing TDs on xrun events and avoids warnings about TRB pointer mismatches.
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Original NVD description (English source)
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.