CVE-2026-90030

In the Linux kernel, the following vulnerability has been resolved:

usb: dwc3: clear forceRM when issuing EndTransfer

The forceRM bit of the DEPCMD register controls the behavior of the

EndTransfer command used to stop an active transfer. Older DWC3

programming guide revisions recommended setting forceRM=1 when

issuing EndTransfer. Newer programming guide revisions recommend

issuing EndTransfer with forceRM cleared.

With forceRM=1 on DWC_usb31 v2.00a and v2.10a controllers, a transfer

aborted through the ep_dequeue path was observed to remain active

after EndTransfer completion. A subsequent StartTransfer issued on the

same endpoint triggered writes associated with the aborted transfer.

This resulted in an SMMU fault because the transfer buffer had already

been unmapped during EndTransfer command-completion cleanup.

Using forceRM=0 eliminates the issue. Although older DWC3 programming

guide revisions recommended setting forceRM=1, no issues are known

from using forceRM=0. Clear forceRM when issuing EndTransfer to provide

consistent EndTransfer behavior and align with newer programming guide

recommendations.