CVE-2026-64342

Freed-memory access via unstopped write URBs

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel iowarrior USB driver allows local users to access freed kernel memory during device disconnect. The disconnect path frees the driver's state while submitted write URBs can remain active, allowing iowarrior_write_callback to dereference that state when an URB completes. Reachability requires a connected I/O-Warrior device with an asynchronous write pending; public evidence establishes the invalid access but no specific crash, privilege gain, or code execution.

CVSS severity7.0
High
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 iowarrior USB driver allows local users to access freed kernel memory during device disconnect. The disconnect path frees the driver's state while submitted write URBs can remain active, allowing iowarrior_write_callback to dereference that state when an URB completes. Reachability requires a connected I/O-Warrior device with an asynchronous write pending; public evidence establishes the invalid access but no specific crash, privilege gain, or code execution.

The record

CVE
CVE-2026-64342
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

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=2.6.21
  2. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <164398601a7f160bc3df1efa454f983302cef03f
  3. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <97ad9337127be04ca0b027c2b01e69302353f404
  4. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <a7bbe946ca3a6eeb6f364d5e84b05e02c7c0d595
  5. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <b748f97aff339e7f08dca9cf38a05b980fb66fea
  6. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <bc0e4f16c44e50daa0b1ea729934baa3b4815dee
  7. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <d058d377291567b72aea33b017215cbfb383b0ad
  8. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <e4596816984efc537e7c04c1af0c639394f967f7
  9. Affected versionversion=946b960d13c15f050a3b848987aaca79f6a459b7 <f328b0e9a0dbd162f5db1b83026b689f2fea2241

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.21; version=946b960d13c15f050a3b848987aaca79f6a459b7 <164398601a7f160bc3df1efa454f983302cef03f; version=946b960d13c15f050a3b848987aaca79f6a459b7 <97ad9337127be04ca0b027c2b01e69302353f404; version=946b960d13c15f050a3b848987aaca79f6a459b7 <a7bbe946ca3a6eeb6f364d5e84b05e02c7c0d595; version=946b960d13c15f050a3b848987aaca79f6a459b7 <b748f97aff339e7f08dca9cf38a05b980fb66fea; version=946b960d13c15f050a3b848987aaca79f6a459b7 <bc0e4f16c44e50daa0b1ea729934baa3b4815dee; version=946b960d13c15f050a3b848987aaca79f6a459b7 <d058d377291567b72aea33b017215cbfb383b0ad; version=946b960d13c15f050a3b848987aaca79f6a459b7 <e4596816984efc537e7c04c1af0c639394f967f7; version=946b960d13c15f050a3b848987aaca79f6a459b7 <f328b0e9a0dbd162f5db1b83026b689f2fea2241

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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 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

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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