CVE-2026-74679

Kernel memory disclosure via signed NDP offset overflow

Published Aug 22, 2026 · Updated Aug 22, 2026

Out-of-bounds read in Linux kernel USB gadget NCM code allows physically proximate attackers to read past the NDP buffer via a crafted offset. The f_ncm path stores get_ncm()'s unsigned result in signed ndp_index, letting a large offset become negative and pass unsigned bounds checks. The target must expose gadget NCM to a connected malicious USB host, and the resulting access exposes adjacent kernel memory.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux kernel USB gadget NCM code allows physically proximate attackers to read past the NDP buffer via a crafted offset. The f_ncm path stores get_ncm()'s unsigned result in signed ndp_index, letting a large offset become negative and pass unsigned bounds checks. The target must expose gadget NCM to a connected malicious USB host, and the resulting access exposes adjacent kernel memory.

The record

CVE
CVE-2026-74679
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=3.17
  2. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <11413d7ed42174b8f5d8d0b6a25d10dc88239b21
  3. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3
  4. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <6b1c8a9403a26cb0fed7a648916c74dc236da591
  5. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <9c8c6825a750fcd3efbe922847ca70ccd5a66857
  6. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <a1c0deeba4a46481543d6b09c665f758c54c3a1a
  7. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <d13f650a3485b58c124b3cda45597e8002c9c833
  8. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <d328fdc607fa1bb668ad512e1c918a120f78f337
  9. Affected versionversion=370af734dfaf8336b496b386e194648e097e248a <fc9e54e22845c4da29588ca0986cb7c795b5a262

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=370af734dfaf8336b496b386e194648e097e248a <11413d7ed42174b8f5d8d0b6a25d10dc88239b21; version=370af734dfaf8336b496b386e194648e097e248a <5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3; version=370af734dfaf8336b496b386e194648e097e248a <6b1c8a9403a26cb0fed7a648916c74dc236da591; version=370af734dfaf8336b496b386e194648e097e248a <9c8c6825a750fcd3efbe922847ca70ccd5a66857; version=370af734dfaf8336b496b386e194648e097e248a <a1c0deeba4a46481543d6b09c665f758c54c3a1a; version=370af734dfaf8336b496b386e194648e097e248a <d13f650a3485b58c124b3cda45597e8002c9c833; version=370af734dfaf8336b496b386e194648e097e248a <d328fdc607fa1bb668ad512e1c918a120f78f337; version=370af734dfaf8336b496b386e194648e097e248a <fc9e54e22845c4da29588ca0986cb7c795b5a262

Published CVSS scores

4.6Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS: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.

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No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1200Hardware Additions

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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