CVE-2026-98018Hinoki check available

Kernel memory corruption via unlocked I3C probe

Published Sep 25, 2026 · Updated Sep 25, 2026

Use-after-free in the Linux kernel 6.7 MCTP I3C driver allows attackers to corrupt kernel memory via a probe and bus-removal race. mctp_i3c_probe releases busdevs_lock after finding a bus, so concurrent I3C_NOTIFY_BUS_REMOVE can free mbus before mctp_i3c_add_device inserts through it. Reachability requires the MCTP-over-I3C driver and a concurrent bus-removal notification while a device probe is in progress.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in the Linux kernel 6.7 MCTP I3C driver allows attackers to corrupt kernel memory via a probe and bus-removal race. mctp_i3c_probe releases busdevs_lock after finding a bus, so concurrent I3C_NOTIFY_BUS_REMOVE can free mbus before mctp_i3c_add_device inserts through it. Reachability requires the MCTP-over-I3C driver and a concurrent bus-removal notification while a device probe is in progress.

The record

CVE
CVE-2026-98018
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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?

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  1. Affected versionversion=6.7
  2. Affected versionversion=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <2b4707a149a55e8fa75c9ef32b359d60f470a566
  3. Affected versionversion=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <765c5e357e67916a7aac8ead4ac2fa7d2bffe000
  4. Affected versionversion=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <906d8dbafabfa81a30e3ade420cb9912f223a5e1
  5. Affected versionversion=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <e6541b2747682fdb2c6ded4a7cf7c39c4067a35c

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <2b4707a149a55e8fa75c9ef32b359d60f470a566; version=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <765c5e357e67916a7aac8ead4ac2fa7d2bffe000; version=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <906d8dbafabfa81a30e3ade420cb9912f223a5e1; version=c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 <e6541b2747682fdb2c6ded4a7cf7c39c4067a35c

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)
VectorUnavailable
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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