net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check (CVE-2026-23447) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-23447

net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check

Answer in brief

CVE-2026-23447 records a Unknown severity vulnerability in net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 3, 2026Updated Sep 14, 2026Source checked Sep 14, 2026First seen by HOL Sep 14, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=0fa81b304a7973a499f844176ca031109487dd31 <baf246d6680befde2086b1df9eb3aaba3fb6853f \|\| >=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	baf246d6680befde2086b1df9eb3aaba3fb6853f, 125f932a76a97904ef8a555f1dd53e5d0e288c54, af0d1613d6751489dbf9f69aac1123f0b1e566e5, a5bd5a2710310c965ea4153cba4210988a3454e2, de70da1fb1d152e981ecb3157f7ec2b633005c16, 77914255155e68a20aa41175edeecf8121dac391, 4.15, 4.20, 5.5
Linux/Linuxgeneric	5.7	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to baf246d6680befde2086b1df9eb3aaba3fb6853f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Apr 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 14, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.