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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 125f932a76a97904ef8a555f1dd53e5d0e288c54, 4.15, 4.20; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 125f932a76a97904ef8a555f1dd53e5d0e288c54, 4.15, 4.20; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Apr 3, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.14.317 and later · before 4.15
  • linux linux kernel4.19.285 and later · before 4.20
  • linux linux kernel5.4.245 and later · before 5.5
  • linux linux kernel5.7.1 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.20
  • linux linux kernel6.19 and later · before 6.19.10
  • linux linux kernel5.7
  • linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 8cf7db86a8984ffa3a3388a8df12bc0aa4c79bd7, 4ca8b8855264cf1439cdab3da7049bd1e3c2a9e6, a270ca35a9499b58366d696d3290eaa4697a42db, 5.7affected
    • 0fa81b304a7973a499f844176ca031109487dd31 and later · before baf246d6680befde2086b1df9eb3aaba3fb6853faffected · git
    • 0fa81b304a7973a499f844176ca031109487dd31 and later · before 125f932a76a97904ef8a555f1dd53e5d0e288c54affected · git
    • 0fa81b304a7973a499f844176ca031109487dd31 and later · before af0d1613d6751489dbf9f69aac1123f0b1e566e5affected · git
    • 0fa81b304a7973a499f844176ca031109487dd31 and later · before a5bd5a2710310c965ea4153cba4210988a3454e2affected · git
    • 0fa81b304a7973a499f844176ca031109487dd31 and later · before de70da1fb1d152e981ecb3157f7ec2b633005c16affected · git
    • 0fa81b304a7973a499f844176ca031109487dd31 and later · before 77914255155e68a20aa41175edeecf8121dac391affected · git
    • 4.14.317 and later · before 4.15affected · semver
    • 4.19.285 and later · before 4.20affected · semver
    • 5.4.245 and later · before 5.5affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.10-16.19.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-23441Apr 3, 2026 · net/mlx5e: Prevent concurrent access to IPSec ASO context
    18Monitor
  • ← EarlierCVE-2026-23443Apr 3, 2026 · ACPI: processor: Fix previous acpi_processor_errata_piix4() fix
    22Monitor
  • Later →CVE-2026-23448Apr 3, 2026 · net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux125f932a76a97904ef8a555f1dd53e5d0e288c54Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux77914255155e68a20aa41175edeecf8121dac391Vendor (CNA)
Linux Linuxa5bd5a2710310c965ea4153cba4210988a3454e2Vendor (CNA)
Linux Linuxaf0d1613d6751489dbf9f69aac1123f0b1e566e5Vendor (CNA)
Linux Linuxbaf246d6680befde2086b1df9eb3aaba3fb6853fVendor (CNA)
Linux Linuxde70da1fb1d152e981ecb3157f7ec2b633005c16Vendor (CNA)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.85-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-64018107 days apartnet: mana: validate rx_req_idx to prevent out-of-bounds array access
    37Monitor
  • CVE-2026-2324616 days apartwifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
    35Monitor
  • CVE-2026-4311033 days apartwifi: brcmfmac: validate bsscfg indices in IF events
    35Monitor
  • CVE-2026-4317233 days apartwifi: iwlwifi: fix 22000 series SMEM parsing
    35Monitor
  • CVE-2026-234480 days apartnet: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check
    31Monitor
  • CVE-2026-233549 days apartx86/fred: Correct speculative safety in fred_extint()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-129 · Improper Validation of Array Index

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records