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CVE-2026-31607 is a Linux kernel vulnerability in the USB/IP subsystem caused by insufficient validation of the number_of_packets field in usbip_pack_ret_submit(). When a USB/IP client processes a RET_SUBMIT response, the function overwrites urb->number_of_packets with the value supplied in the network PDU without ensuring it does not exceed the packet count used when the URB and its iso_frame_desc[] flexible array were originally allocated from the preceding CMD_SUBMIT request. The overwritten value is later used as the loop bound in usbip_recv_iso() and usbip_pad_iso(). A malicious USB/IP server can therefore return a larger number_of_packets value than originally submitted, causing usbip_recv_iso() to write past the end of urb->iso_frame_desc[] and trigger a heap out-of-bounds write. The issue was confirmed by KASAN as a slab out-of-bounds write in usbip_recv_iso(). The fix adds validation in usbip_pack_ret_submit() to ensure the response packet count does not exceed the original URB packet count before overwriting the field, and clamps invalid values to zero so downstream processing exits safely.
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A Linux kernel USB/IP vulnerability caused by insufficient validation of number_of_packets in usbip_pack_ret_submit().
A Linux kernel vulnerability in usbip_pack_ret_submit() related to insufficient validation of number_of_packets.
A Linux kernel vulnerability in usbip involving insufficient validation of number_of_packets in usbip_pack_ret_submit().
Linux kernel vulnerability in usbip_pack_ret_submit related to validation of number_of_packets.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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