CVE-2026-53336

System hang via unadvanced unknown TLV offset

Published Jul 1, 2026 · Updated Jul 1, 2026

Denial of service in the Linux kernel ONIE TLV layout parser allows local users to hang the system via an unknown EEPROM TLV type. In drivers/nvmem/layouts/onie-tlv.c, the unknown-type branch continues without advancing the table offset, so parsing repeats the same entry indefinitely. Reachability requires local control of ONIE-formatted EEPROM data containing an unsupported type; the resulting endless loop interrupts system availability.

CVSS severity5.5
Medium
EPSS probability0.16%
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 kernel ONIE TLV layout parser allows local users to hang the system via an unknown EEPROM TLV type. In drivers/nvmem/layouts/onie-tlv.c, the unknown-type branch continues without advancing the table offset, so parsing repeats the same entry indefinitely. Reachability requires local control of ONIE-formatted EEPROM data containing an unsupported type; the resulting endless loop interrupts system availability.

The record

CVE
CVE-2026-53336
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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=6.4
  2. Affected versionversion=d3c0d12f6474216bf386101e2449cc73e5c5b61d <033d498b0f473c6456be5f885be172024ad84972
  3. Affected versionversion=d3c0d12f6474216bf386101e2449cc73e5c5b61d <4a4d21f531ccf5bb333d99b620e0d66551f3652c
  4. Affected versionversion=d3c0d12f6474216bf386101e2449cc73e5c5b61d <4f27eb01619c36cc8e3ce9a2a9af97f145f5d1c6
  5. Affected versionversion=d3c0d12f6474216bf386101e2449cc73e5c5b61d <ea41020b9018e31c2ea7e9d89021e3e6d7470883
  6. Affected versionversion=d3c0d12f6474216bf386101e2449cc73e5c5b61d <fd47edeabadfaa75422009dc5894e92c4c697517

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.4; version=d3c0d12f6474216bf386101e2449cc73e5c5b61d <033d498b0f473c6456be5f885be172024ad84972; version=d3c0d12f6474216bf386101e2449cc73e5c5b61d <4a4d21f531ccf5bb333d99b620e0d66551f3652c; version=d3c0d12f6474216bf386101e2449cc73e5c5b61d <4f27eb01619c36cc8e3ce9a2a9af97f145f5d1c6; version=d3c0d12f6474216bf386101e2449cc73e5c5b61d <ea41020b9018e31c2ea7e9d89021e3e6d7470883; version=d3c0d12f6474216bf386101e2449cc73e5c5b61d <fd47edeabadfaa75422009dc5894e92c4c697517

Published CVSS scores

5.5NVDCVSS: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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

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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