CVE-2024-27405Network attack vector

Network service interruption via padded NCM transfers

Published May 17, 2024 · Updated May 11, 2026

Denial of service in the Linux USB NCM gadget driver allows remote attackers to interrupt tethered network traffic via padded NTBs. ncm_unwrap_ntb treats every byte remaining after a valid NTB as another NTB; when the extra byte is invalid, error handling discards valid datagrams already queued in rx_list. Exposure requires an enabled USB NCM gadget connected to a host that appends a padding byte, and the observed consequence is packet loss rather than a kernel crash.

CVSS severity7.5
High
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux USB NCM gadget driver allows remote attackers to interrupt tethered network traffic via padded NTBs. ncm_unwrap_ntb treats every byte remaining after a valid NTB as another NTB; when the extra byte is invalid, error handling discards valid datagrams already queued in rx_list. Exposure requires an enabled USB NCM gadget connected to a host that appends a padding byte, and the observed consequence is packet loss rather than a kernel crash.

The record

CVE
CVE-2024-27405
Published
May 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.38
  2. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <059285e04ebb273d32323fbad5431c5b94f77e48
  3. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <2b7ec68869d50ea998908af43b643bca7e54577e
  4. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <2cb66b62a5d64ccf09b0591ab86fb085fa491fc5
  5. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <35b604a37ec70d68b19dafd10bbacf1db505c9ca
  6. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <57ca0e16f393bb21d69734e536e383a3a4c665fd
  7. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <76c51146820c5dac629f21deafab0a7039bc3ccd
  8. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <a31cf46d108dabce3df80b3e5c07661e24912151
  9. Affected versionversion=9f6ce4240a2bf456402c15c06768059e5973f28c <c7f43900bc723203d7554d299a2ce844054fab8e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.38; version=9f6ce4240a2bf456402c15c06768059e5973f28c <059285e04ebb273d32323fbad5431c5b94f77e48; version=9f6ce4240a2bf456402c15c06768059e5973f28c <2b7ec68869d50ea998908af43b643bca7e54577e; version=9f6ce4240a2bf456402c15c06768059e5973f28c <2cb66b62a5d64ccf09b0591ab86fb085fa491fc5; version=9f6ce4240a2bf456402c15c06768059e5973f28c <35b604a37ec70d68b19dafd10bbacf1db505c9ca; version=9f6ce4240a2bf456402c15c06768059e5973f28c <57ca0e16f393bb21d69734e536e383a3a4c665fd; version=9f6ce4240a2bf456402c15c06768059e5973f28c <76c51146820c5dac629f21deafab0a7039bc3ccd; version=9f6ce4240a2bf456402c15c06768059e5973f28c <a31cf46d108dabce3df80b3e5c07661e24912151; version=9f6ce4240a2bf456402c15c06768059e5973f28c <c7f43900bc723203d7554d299a2ce844054fab8e
The Linux Kernel Organization · Linux Kernelversion=2.6.38; version=9f6ce4240a2b

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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