CVE-2026-93200

Kernel use-after-free via premature i3c device free

Published Sep 17, 2026 · Updated Oct 3, 2026

Use-after-free in the i3c master controller in Linux 5.0 and affected later branches allows local users to trigger stale-pointer access via sysfs. During device detachment, i3c_master_detach_free_devs() frees master->this before the master device and its sysfs callbacks are released. The condition requires an i3c master device undergoing teardown; the published record does not establish privilege escalation or a specific crash outcome.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the i3c master controller in Linux 5.0 and affected later branches allows local users to trigger stale-pointer access via sysfs. During device detachment, i3c_master_detach_free_devs() frees master->this before the master device and its sysfs callbacks are released. The condition requires an i3c master device undergoing teardown; the published record does not establish privilege escalation or a specific crash outcome.

The record

CVE
CVE-2026-93200
Published
Sep 17, 2026
Updated
Oct 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 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=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <23a1c4288a60e253a05a882bd8928ed61beb4a48
  2. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <4f3145db05fede36b35f8249b8acde5bd5d54864
  3. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <50034d8d0f797c3a7a599f750a7d3e792e80dea5
  4. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <feb0ed76601f3c2f91f08688c5a7d8b9d382f720
  5. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <23a1c4288a60e253a05a882bd8928ed61beb4a48; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <4f3145db05fede36b35f8249b8acde5bd5d54864; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <50034d8d0f797c3a7a599f750a7d3e792e80dea5; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <feb0ed76601f3c2f91f08688c5a7d8b9d382f720; version=5.0

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
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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