7.8

CVE-2026-23447: net: usb: cdc_ncm: add ndpoffset to NDP32 nframes bounds check

Modified
AliasesUBUNTU-CVE-2026-23447DEBIAN-CVE-2026-23447
Published 03-04-2026Last modified 14-09-2026

Vulnerability summary

CVE-2026-23447 is a high (CVSS 7.8) Improper Validation of Array Index vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 16 · Related 16
SUSE-SU-2026:21834-1SUSE-SU-2026:2238-1USN-8567-1USN-8574-1USN-8574-2USN-8574-3

Timeline

  1. 03-04-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.13% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu153 products
  • linuxAll versions (No fix recorded) | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 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 | 5.7
  • linux_kernel≥ 4.14.317, < 4.15 | ≥ 4.19.285, < 4.20 | ≥ 5.4.245, < 5.5 | ≥ 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:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 156 products

References

24 links
Show all 24 references