CVE-2024-26659

/// Technical description

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

xhci: handle isoc Babble and Buffer Overrun events properly

xHCI 4.9 explicitly forbids assuming that the xHC has released its

ownership of a multi-TRB TD when it reports an error on one of the

early TRBs. Yet the driver makes such assumption and releases the TD,

allowing the remaining TRBs to be freed or overwritten by new TDs.

The xHC should also report completion of the final TRB due to its IOC

flag being set by us, regardless of prior errors. This event cannot

be recognized if the TD has already been freed earlier, resulting in

"Transfer event TRB DMA ptr not part of current TD" error message.

Fix this by reusing the logic for processing isoc Transaction Errors.

This also handles hosts which fail to report the final completion.

Fix transfer length reporting on Babble errors. They may be caused by

device malfunction, no guarantee that the buffer has been filled.

/// 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