CVE-2026-64574

Local kernel crash via dangling debugfs entries

Published Aug 5, 2026 · Updated Aug 5, 2026

Use-after-free in the mac80211 subsystem of Linux 6.4 allows local users to crash the kernel through dangling debugfs entries. After drv_change_vif_links() fails, ieee80211_vif_update_links() frees new link containers without removing debugfs files whose private data still points into them. Local users with CAP_NET_ADMIN in the relevant network namespace can add a duplicate-address MLO link and read the stale file, causing memory corruption and a kernel panic.

CVSS severity7.8
High
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-after-free in the mac80211 subsystem of Linux 6.4 allows local users to crash the kernel through dangling debugfs entries. After drv_change_vif_links() fails, ieee80211_vif_update_links() frees new link containers without removing debugfs files whose private data still points into them. Local users with CAP_NET_ADMIN in the relevant network namespace can add a duplicate-address MLO link and read the stale file, causing memory corruption and a kernel panic.

The record

CVE
CVE-2026-64574
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <0f7eaeb950adb77f71beb546e5ab30f90b41fe6f
  2. Affected versionversion=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <329589417214d3b7221432e5b266ed2bba7ff674
  3. Affected versionversion=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <901a73523e093beff123b54b1ceaf3113f18acc9
  4. Affected versionversion=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <952c02b33f56207a160421bcd61e7ac53c9c59ae
  5. Affected versionversion=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <c57d97f381306bbfba174e8f708419e007824e0c
  6. Affected versionversion=6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <0f7eaeb950adb77f71beb546e5ab30f90b41fe6f; version=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <329589417214d3b7221432e5b266ed2bba7ff674; version=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <901a73523e093beff123b54b1ceaf3113f18acc9; version=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <952c02b33f56207a160421bcd61e7ac53c9c59ae; version=170cd6a66d9a164180eb4dc72d50afa6ce1ce566 <c57d97f381306bbfba174e8f708419e007824e0c; version=6.4

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
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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