CVE-2026-23466

Unsafe kernel MMIO access via GGTT teardown race

Published Apr 3, 2026 · Updated Apr 3, 2026

Race condition in the Linux Kernel drm/xe driver allows local users to trigger unsafe GGTT MMIO access during teardown. The driver relies on drm_dev_enter, but a failed load never calls drm_dev_unplug, while asynchronous workers can free mapped buffer objects after the GGTT MMIO region is removed. The issue requires low-privileged local access and a failed driver-load teardown; Linux has not published a concrete crash, corruption, or disclosure outcome.

CVSS severity7.8
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

Race condition in the Linux Kernel drm/xe driver allows local users to trigger unsafe GGTT MMIO access during teardown. The driver relies on drm_dev_enter, but a failed load never calls drm_dev_unplug, while asynchronous workers can free mapped buffer objects after the GGTT MMIO region is removed. The issue requires low-privileged local access and a failed driver-load teardown; Linux has not published a concrete crash, corruption, or disclosure outcome.

The record

CVE
CVE-2026-23466
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=6.12
  2. Affected versionversion=919bb54e989c1edef87e9797be125c94c450fc65 <01f2557aa684e514005541e71a3d01f4cd45c170
  3. Affected versionversion=919bb54e989c1edef87e9797be125c94c450fc65 <1e9e2640d870d4837bcfdc220cb2c99ae5ee119f
  4. Affected versionversion=919bb54e989c1edef87e9797be125c94c450fc65 <76326dc06d8793c2c81c31cc0115dbc348de2f88
  5. Affected versionversion=919bb54e989c1edef87e9797be125c94c450fc65 <e2b424aadecb640f9e037b2891191cf8fd4c64cf

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=919bb54e989c1edef87e9797be125c94c450fc65 <01f2557aa684e514005541e71a3d01f4cd45c170; version=919bb54e989c1edef87e9797be125c94c450fc65 <1e9e2640d870d4837bcfdc220cb2c99ae5ee119f; version=919bb54e989c1edef87e9797be125c94c450fc65 <76326dc06d8793c2c81c31cc0115dbc348de2f88; version=919bb54e989c1edef87e9797be125c94c450fc65 <e2b424aadecb640f9e037b2891191cf8fd4c64cf

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/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 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

T1068Exploitation for Privilege Escalation

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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