CVE-2026-90404

Invalid memory access via retained panic notifier

Published Sep 17, 2026 · Updated Sep 17, 2026

Use-after-free in the cros_ec_debugfs driver in Linux 6.3 allows local users to trigger invalid memory access via EC panic events. The remove path releases debugfs and console-log state without unregistering notifier_panic, leaving a callback that queues work against released data. Triggering requires driver removal followed by an EC panic notification; SUSE assesses administrative privileges and availability-only impact, but the precise crash or hang outcome is not published.

CVSS severity4.1
Medium
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 cros_ec_debugfs driver in Linux 6.3 allows local users to trigger invalid memory access via EC panic events. The remove path releases debugfs and console-log state without unregistering notifier_panic, leaving a callback that queues work against released data. Triggering requires driver removal followed by an EC panic notification; SUSE assesses administrative privileges and availability-only impact, but the precise crash or hang outcome is not published.

The record

CVE
CVE-2026-90404
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=6.3
  2. Affected versionversion=d90fa2c64d59f5f151beeef5dbc599784b3391ca <05c1081ae4503e45b934b390350f942db3208892
  3. Affected versionversion=d90fa2c64d59f5f151beeef5dbc599784b3391ca <56989e2a9c292ff7689603feed41d030301ca636
  4. Affected versionversion=d90fa2c64d59f5f151beeef5dbc599784b3391ca <a5d3128b06ccfc398c2e456fddebadce52310bd8
  5. Affected versionversion=d90fa2c64d59f5f151beeef5dbc599784b3391ca <e2cbe14361d7cb0b5abd66d87f3afa0e16efde9f
  6. Affected versionversion=d90fa2c64d59f5f151beeef5dbc599784b3391ca <e5954d3031fb55dd31aa59bae477d63c68e941c0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=d90fa2c64d59f5f151beeef5dbc599784b3391ca <05c1081ae4503e45b934b390350f942db3208892; version=d90fa2c64d59f5f151beeef5dbc599784b3391ca <56989e2a9c292ff7689603feed41d030301ca636; version=d90fa2c64d59f5f151beeef5dbc599784b3391ca <a5d3128b06ccfc398c2e456fddebadce52310bd8; version=d90fa2c64d59f5f151beeef5dbc599784b3391ca <e2cbe14361d7cb0b5abd66d87f3afa0e16efde9f; version=d90fa2c64d59f5f151beeef5dbc599784b3391ca <e5954d3031fb55dd31aa59bae477d63c68e941c0

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5TenableCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
4.9TenableAV:L/AC:L/Au:N/C:N/I:N/A:C

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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