CVE-2026-23447 net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check
A missing bounds check in the Linux kernel's CDC NCM driver allows out-of-bounds reads, potentially causing crashes or information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23447?
CVE-2026-23447 is a high-severity memory corruption vulnerability in Linux kernel, published on 3 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check
The same bounds-check bug fixed for NDP16 in the previous patch also exists in cdc_ncm_rx_verify_ndp32(). The DPE array size is validated against the total skb length without accounting for ndpoffset, allowing out-of-bounds reads when the NDP32 is placed near the end of the NTB.
Add ndpoffset to the nframes bounds check and use struct_size_t() to express the NDP-plus-DPE-array size more clearly.
Compile-tested only.
Weakness: CWE-129
Which versions are affected by CVE-2026-23447?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23447?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23447 being exploited?
There is no known exploitation of CVE-2026-23447 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23447, DEBIAN-CVE-2026-23447, GHSA-vf6v-fqr8-5xhj, ROOT-OS-DEBIAN-11-CVE-2026-23447, ROOT-OS-DEBIAN-12-CVE-2026-23447, ROOT-OS-DEBIAN-13-CVE-2026-23447 and 3 more.