CVE-2026-23447
Out-of-Bounds Read in Linux cdc_ncm USB Network Driver
Publication date: 2026-04-03
Last updated on: 2026-04-23
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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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 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel's USB CDC NCM driver, specifically in the function cdc_ncm_rx_verify_ndp32(). It involves a bounds-check bug where the size of the DPE array is validated against the total skb length without considering the ndpoffset. This omission allows out-of-bounds reads when the NDP32 structure is located near the end of the NTB (Network Transfer Block). The fix adds the ndpoffset to the nframes bounds check and uses struct_size_t() to clarify the size calculation.
How can this vulnerability impact me? :
This vulnerability can lead to out-of-bounds memory reads in the Linux kernel's USB CDC NCM driver. Such out-of-bounds reads may cause system instability, crashes, or potentially expose sensitive kernel memory contents, which could be exploited by attackers to gain unauthorized information or cause denial of service.