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CVE-2026-23447: net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-09-14
• Weakness: CWE-129

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.

Affected products

• Linux kernel: from 4.14.317 before 4.15; from 4.19.285 before 4.20; from 5.4.245 before 5.5; from 5.7.1 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20 — fixed in 4.15, 4.20, 5.5, 6.12.78, 6.18.20, 6.19.10

How to fix

Upgrade to a fixed version: Linux kernel 4.15, 4.20, 5.5, 6.12.78. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/125f932a76a97904ef8a555f1dd53e5d0e288c54
• https://git.kernel.org/stable/c/77914255155e68a20aa41175edeecf8121dac391
• https://git.kernel.org/stable/c/a5bd5a2710310c965ea4153cba4210988a3454e2
• https://git.kernel.org/stable/c/af0d1613d6751489dbf9f69aac1123f0b1e566e5
• https://git.kernel.org/stable/c/baf246d6680befde2086b1df9eb3aaba3fb6853f
• https://git.kernel.org/stable/c/de70da1fb1d152e981ecb3157f7ec2b633005c16

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