CVE-2026-64220

Local system crash via uninitialized secondary pointer

Published Jul 24, 2026 · Updated Jul 24, 2026

Use of an uninitialized pointer in Linux Kernel allows local users to crash the system through firmware-node handling. fwnode_init leaves fwnode->secondary unchanged for stack objects or memory from non-zeroing allocators, so dev_to_swnode can dereference an indeterminate address. Reaching the flaw requires local low-privileged access and a path that creates such a firmware node; the documented consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized pointer in Linux Kernel allows local users to crash the system through firmware-node handling. fwnode_init leaves fwnode->secondary unchanged for stack objects or memory from non-zeroing allocators, so dev_to_swnode can dereference an indeterminate address. Reaching the flaw requires local low-privileged access and a path that creates such a firmware node; the documented consequence is a system crash.

The record

CVE
CVE-2026-64220
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=01bb86b380a306bd937c96da36f66429f3362137 <215c90ee656114f5e8c32408228d97082f8e0eef
  2. Affected versionversion=01bb86b380a306bd937c96da36f66429f3362137 <34bf74b1fd2e4a44e27821a329204caf09df2976
  3. Affected versionversion=01bb86b380a306bd937c96da36f66429f3362137 <371f53925a6714d0aa35f1aefdffc3e8cd62f480
  4. Affected versionversion=01bb86b380a306bd937c96da36f66429f3362137 <3f1024deeab3b5443c29b3de4fe475e87309b8fa
  5. Affected versionversion=01bb86b380a306bd937c96da36f66429f3362137 <508fd8ab158abd04b7f7d0f707cd6d6c405df4ea
  6. Affected versionversion=01bb86b380a306bd937c96da36f66429f3362137 <f0e211d6539fae800217c10797993b7592d6ab01
  7. Affected versionversion=01bb86b380a306bd937c96da36f66429f3362137 <f59e686c778cb41b8f7aa8fab2afd6a01afb3d47
  8. Affected versionversion=5.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=01bb86b380a306bd937c96da36f66429f3362137 <215c90ee656114f5e8c32408228d97082f8e0eef; version=01bb86b380a306bd937c96da36f66429f3362137 <34bf74b1fd2e4a44e27821a329204caf09df2976; version=01bb86b380a306bd937c96da36f66429f3362137 <371f53925a6714d0aa35f1aefdffc3e8cd62f480; version=01bb86b380a306bd937c96da36f66429f3362137 <3f1024deeab3b5443c29b3de4fe475e87309b8fa; version=01bb86b380a306bd937c96da36f66429f3362137 <508fd8ab158abd04b7f7d0f707cd6d6c405df4ea; version=01bb86b380a306bd937c96da36f66429f3362137 <f0e211d6539fae800217c10797993b7592d6ab01; version=01bb86b380a306bd937c96da36f66429f3362137 <f59e686c778cb41b8f7aa8fab2afd6a01afb3d47; version=5.11

Published CVSS scores

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

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
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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