CVE-2026-64340

Freed-memory access via USB disconnect race

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the legousbtower USB driver from Linux Kernel 2.6.25 allows attackers to trigger unsafe access to freed driver data. The disconnect path relies on a mutex to manage the driver-data lifetime even though mutex_unlock() can still access that mutex, letting concurrent release free the containing structure too early. Triggering requires a legousbtower device plus concurrent file release and physical USB disconnection; no further consequence is published.

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 legousbtower USB driver from Linux Kernel 2.6.25 allows attackers to trigger unsafe access to freed driver data. The disconnect path relies on a mutex to manage the driver-data lifetime even though mutex_unlock() can still access that mutex, letting concurrent release free the containing structure too early. Triggering requires a legousbtower device plus concurrent file release and physical USB disconnection; no further consequence is published.

The record

CVE
CVE-2026-64340
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
physical
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

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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=18bcbcfe9ca2308ebffb40068b51803da9315d97 <0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e
  2. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <11d069f85851997b4ea0adf242ed9672dc749b8f
  3. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <62fc8eb1b1481051f7bab4aa93d79809053dd09f
  4. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee
  5. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <766738ecf2b819e54d38763c8d1c8ae6cff14b39
  6. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <9ba62966461a8e3cc593b62c56ec62eb2d80436d
  7. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <ab2bfd7bec4f134b377ec42f513e90c35db94160
  8. Affected versionversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <b4222c05066b252b451f9c8c4730b5b60824ea66
  9. Affected versionversion=2.6.25

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=18bcbcfe9ca2308ebffb40068b51803da9315d97 <0b57e5ddbd89df3bc367463de3d2ca66f99a1a5e; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <11d069f85851997b4ea0adf242ed9672dc749b8f; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <62fc8eb1b1481051f7bab4aa93d79809053dd09f; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <6462de75d2e370c7e74dcfb7b4ae79eb5a6a55ee; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <766738ecf2b819e54d38763c8d1c8ae6cff14b39; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <9ba62966461a8e3cc593b62c56ec62eb2d80436d; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <ab2bfd7bec4f134b377ec42f513e90c35db94160; version=18bcbcfe9ca2308ebffb40068b51803da9315d97 <b4222c05066b252b451f9c8c4730b5b60824ea66; version=2.6.25

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.

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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)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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