CVE-2026-23447
Received
Received - Intake
Out-of-Bounds Read in Linux cdc_ncm USB Network Driver
Vulnerability report for CVE-2026-23447, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-04-03
Last updated on: 2026-04-23
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 5.7 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | From 6.7 (inc) to 6.12.78 (exc) |
| linux | linux_kernel | From 6.13 (inc) to 6.18.20 (exc) |
| linux | linux_kernel | From 6.19 (inc) to 6.19.10 (exc) |
| linux | linux_kernel | From 4.14.317 (inc) to 4.15 (exc) |
| linux | linux_kernel | From 4.19.285 (inc) to 4.20 (exc) |
| linux | linux_kernel | From 5.4.245 (inc) to 5.5 (exc) |
| linux | linux_kernel | From 5.7.1 (inc) to 6.6.130 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-129 | The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. |
