Usbredir: usbredir: unbounded iso_packet_desc[] index in usbredirhost_iso_packet() leads to heap out-of-bounds write

Overview

An out-of-bounds write flaw was found in usbredir. Starting an isochronous OUT stream with a transfer count of 1 leaves the stream's single transfer buffer permanently unsubmitted, defeating the bounds check in usbredirhost_iso_packet() and allowing a usbredir peer to write past the end of the packet descriptor array on every subsequent isochronous packet.

Affected

• usbredir (all versions)
• usbredir
• usbredir (all versions)
• usbredir (all versions)
• usbredir (all versions)

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Workarounds

If USB redirection is not a required feature, consider removing the usbredir package. This action will eliminate the attack surface but may affect functionality that relies on USB device redirection, particularly in virtualized environments.