CVE-2026-64455

Local invalid read via stale USB interface logging

Published Jul 25, 2026 · Updated Jul 25, 2026

Use-after-free in the Linux Kernel chaoskey USB driver allows local users to trigger an invalid read by closing an unplugged device. chaoskey_release calls chaoskey_free, then a debug statement dereferences the released usb_interface pointer in dev_driver_string. Triggering requires an open chaoskey device followed by physical disconnection; the published evidence demonstrates an eight-byte invalid read under KASAN but no broader consequence.

CVSS severity5.5
Medium
EPSS probability0.18%
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 chaoskey USB driver allows local users to trigger an invalid read by closing an unplugged device. chaoskey_release calls chaoskey_free, then a debug statement dereferences the released usb_interface pointer in dev_driver_string. Triggering requires an open chaoskey device followed by physical disconnection; the published evidence demonstrates an eight-byte invalid read under KASAN but no broader consequence.

The record

CVE
CVE-2026-64455
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=4.1
  2. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <2a52d55c86a429dac47886b8424e67f90b001e67
  3. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89
  4. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023
  5. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <6c82f88bc7a8458d5c60f9b354c4d32d233f0cac
  6. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <8f50613bff228272577893aa10a346a2f3063e49
  7. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <abf76d3239dee97b66e7241ad04811f1ce562e28
  8. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <f3e409476ad0703c54c14f245e4e143c8124e1bd
  9. Affected versionversion=66e3e591891da9899a8990792da080432531ffd4 <fe7a0f4be283b40dd592540027279735120d0d6f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.1; version=66e3e591891da9899a8990792da080432531ffd4 <2a52d55c86a429dac47886b8424e67f90b001e67; version=66e3e591891da9899a8990792da080432531ffd4 <3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89; version=66e3e591891da9899a8990792da080432531ffd4 <5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023; version=66e3e591891da9899a8990792da080432531ffd4 <6c82f88bc7a8458d5c60f9b354c4d32d233f0cac; version=66e3e591891da9899a8990792da080432531ffd4 <8f50613bff228272577893aa10a346a2f3063e49; version=66e3e591891da9899a8990792da080432531ffd4 <abf76d3239dee97b66e7241ad04811f1ce562e28; version=66e3e591891da9899a8990792da080432531ffd4 <f3e409476ad0703c54c14f245e4e143c8124e1bd; version=66e3e591891da9899a8990792da080432531ffd4 <fe7a0f4be283b40dd592540027279735120d0d6f

Published CVSS scores

5.5Amazon LinuxCVSS: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

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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