What is CVE-2026-23447?

CVE-2026-23447 is a high-severity vulnerability in Linux, classified under Improper Validation of Array Index. CVSS score: 7.8/10. Published 2026-04-03.

How severe is CVE-2026-23447?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Linux

CVE-2026-23447

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.

EPSS: 0.001 (2.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 4.14.317, 6.18.20, 6.6.130
Linux Linux_kernel — versions 5.7, 7.0

Weakness classification (CWE)

CWE-129 — Improper Validation of Array Index

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-23447?: CVE-2026-23447 is a high-severity vulnerability in Linux, classified under Improper Validation of Array Index. CVSS score: 7.8/10. Published 2026-04-03.
How severe is CVE-2026-23447?: High severity. CVSS v3 base score is 7.8 out of 10.