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Review reviewHigh

CVE-2026-23447

Linux Linux, linux kernel

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
7.8
EPSS
0.13%
2.90% percentile
CISA KEV
Not listed
Published
2026.04.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 0fa81b304a7973a499f844176ca031109487dd31 < 125f932a76a97904ef8a555f1dd53e5d0e288c54, >= 0fa81b304a7973a499f844176ca031109487dd31 < af0d1613d6751489dbf9f69aac1123f0b1e566e5, >= 0fa81b304a7973a499f844176ca031109487dd31 < a5bd5a2710310c965ea4153cba4210988a3454e2, >= 0fa81b304a7973a499f844176ca031109487dd31 < de70da1fb1d152e981ecb3157f7ec2b633005c16, >= 0fa81b304a7973a499f844176ca031109487dd31 < 77914255155e68a20aa41175edeecf8121dac391, >= 8cf7db86a8984ffa3a3388a8df12bc0aa4c79bd7, >= 4ca8b8855264cf1439cdab3da7049bd1e3c2a9e6, >= a270ca35a9499b58366d696d3290eaa4697a42db, >= 4.14.317 < 4.15, >= 4.19.285 < 4.20, >= 5.4.245 < 5.5, >= 5.7, >= 5.7.1 < 6.6.130, >= 6.7 < 6.12.78, >= 6.13 < 6.18.20, >= 6.19 < 6.19.10, 5.7, 7.0
Fixed versions
4.15, 4.20, 5.5, 6.6.130, 6.12.78, 6.18.20, 6.19.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-129