CVE-2026-64343

Kernel disruption via ldusb disconnect race

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel ldusb driver allows local users to disrupt the kernel by racing device release with USB disconnect. The ldusb release path unlocks its mutex while disconnect can free the same driver data, and mutex_unlock() can still touch that freed lock object. Reaching the race requires access to an ldusb-backed device and concurrent release and disconnect activity; the published impact assessment is limited to availability.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
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 Linux Kernel ldusb driver allows local users to disrupt the kernel by racing device release with USB disconnect. The ldusb release path unlocks its mutex while disconnect can free the same driver data, and mutex_unlock() can still touch that freed lock object. Reaching the race requires access to an ldusb-backed device and concurrent release and disconnect activity; the published impact assessment is limited to availability.

The record

CVE
CVE-2026-64343
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.26
  2. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <02ca08fff74cf9b0a3c4d2cacde1c6edeeb95bb4
  3. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <19bdfc7b3c179331eafa423d87e1336f43bbfeb8
  4. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <2107a4fc8ff1cf1d52f416c1e5cc8e97413a5915
  5. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <a3e794136ab5e3ad1e7019175a4b837aec86db4b
  6. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <af59829e67e11ba2511a9f8e4b9111afc7d1f550
  7. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <d8f69404e1d671326f86d378b9f5bfbd56490e9d
  8. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <e5a9bdce4bfd3e2226b5f3df5fb8385d6935ee69
  9. Affected versionversion=ce0d7d3f575fc1ba6a89c3c651e710355590daff <fc55923a972e715f9a27187b47d4920709e23d85

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.26; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <02ca08fff74cf9b0a3c4d2cacde1c6edeeb95bb4; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <19bdfc7b3c179331eafa423d87e1336f43bbfeb8; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <2107a4fc8ff1cf1d52f416c1e5cc8e97413a5915; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <a3e794136ab5e3ad1e7019175a4b837aec86db4b; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <af59829e67e11ba2511a9f8e4b9111afc7d1f550; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <d8f69404e1d671326f86d378b9f5bfbd56490e9d; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <e5a9bdce4bfd3e2226b5f3df5fb8385d6935ee69; version=ce0d7d3f575fc1ba6a89c3c651e710355590daff <fc55923a972e715f9a27187b47d4920709e23d85

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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