CVE-2022-48938

Service interruption via CDC-NCM fragment offset overflow

Published Aug 22, 2024 · Updated May 23, 2026

Integer overflow in the Linux CDC-NCM driver allows local users to interrupt service by supplying malformed USB network data. In cdc_ncm_rx_fixup(), the sanity check adds an untrusted fragment length to its offset before validating the sum, allowing the addition to wrap and an invalid frame to evade rejection. The attack requires local access and control of a CDC-NCM device; NIST assesses the consequence as availability loss only.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the Linux CDC-NCM driver allows local users to interrupt service by supplying malformed USB network data. In cdc_ncm_rx_fixup(), the sanity check adds an untrusted fragment length to its offset before validating the sum, allowing the addition to wrap and an invalid frame to evade rejection. The attack requires local access and control of a CDC-NCM device; NIST assesses the consequence as availability loss only.

The record

CVE
CVE-2022-48938
Published
Aug 22, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0fa81b304a7973a499f844176ca031109487dd31 <49909c9f8458cacb5b241106cba65aba5a6d8f4c
  2. Affected versionversion=0fa81b304a7973a499f844176ca031109487dd31 <69560efa001397ebb8dc1c3e6a3ce00302bb9f7f
  3. Affected versionversion=0fa81b304a7973a499f844176ca031109487dd31 <7b737e47b87589031f0d4657f6d7b0b770474925
  4. Affected versionversion=0fa81b304a7973a499f844176ca031109487dd31 <8d2b1a1ec9f559d30b724877da4ce592edc41fdc
  5. Affected versionversion=4.14.317 <4.15
  6. Affected versionversion=4.19.285 <4.19.323
  7. Affected versionversion=4ca8b8855264cf1439cdab3da7049bd1e3c2a9e6 <a612395c7631918e0e10ea48b9ce5ab4340f26a6
  8. Affected versionversion=5.4.245 <5.4.285
  9. Affected versionversion=5.7
  10. Affected versionversion=8cf7db86a8984ffa3a3388a8df12bc0aa4c79bd7
  11. Affected versionversion=a270ca35a9499b58366d696d3290eaa4697a42db <9957fbf34f52a4d8945d1bf39aae400ef9a11246

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0fa81b304a7973a499f844176ca031109487dd31 <49909c9f8458cacb5b241106cba65aba5a6d8f4c; version=0fa81b304a7973a499f844176ca031109487dd31 <69560efa001397ebb8dc1c3e6a3ce00302bb9f7f; version=0fa81b304a7973a499f844176ca031109487dd31 <7b737e47b87589031f0d4657f6d7b0b770474925; version=0fa81b304a7973a499f844176ca031109487dd31 <8d2b1a1ec9f559d30b724877da4ce592edc41fdc; version=4.14.317 <4.15; version=4.19.285 <4.19.323; version=4ca8b8855264cf1439cdab3da7049bd1e3c2a9e6 <a612395c7631918e0e10ea48b9ce5ab4340f26a6; version=5.4.245 <5.4.285; version=5.7; version=8cf7db86a8984ffa3a3388a8df12bc0aa4c79bd7; version=a270ca35a9499b58366d696d3290eaa4697a42db <9957fbf34f52a4d8945d1bf39aae400ef9a11246

Published CVSS scores

5.4SUSECVSS:4.0/AV:P/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
6.6SUSECVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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