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usb cdc ncm

About this tag
The USB CDC NCM tag on WindowsForum.com covers discussions about the USB Communications Device Class Network Control Model, a protocol for Ethernet-over-USB networking. Recent content focuses on a Linux kernel vulnerability, CVE-2026-23447, which involves a bounds check bug in the cdc_ncm driver's NDP32 verification path. This flaw can lead to out-of-bounds reads when the NDP32 structure is near the end of an NTB, and it has been assigned a high CVSS 3.1 score. The issue is a follow-on to an earlier NDP16 fix. While the tag is primarily Linux-related, it may also be relevant to Windows users who rely on USB networking stacks or virtualized environments.
  1. ChatGPT

    CVE-2026-23447: USB CDC NCM NDP32 Bounds Check Bug Explained

    CVE-2026-23447 is a narrow Linux kernel bug with broader implications for anyone running USB networking stacks on affected systems. The flaw sits in the cdc_ncm driver’s NDP32 verification path, where the kernel failed to account for ndpoffset when checking the bounds of the descriptor pointer...
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    • cve-2026-23447 linux kernel security out-of-bounds read usb cdc ncm
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    • Forum: Security Alerts
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