CVE-2025-40263

Kernel crash via uninitialized input-device pointer

Published Dec 4, 2025 · Updated Jun 2, 2026

NULL-pointer dereference in the Linux cros_ec_keyb driver allows local users to crash the kernel through a malformed EC key-matrix event. In a buttons-and-switches-only configuration, cros_ec_keyb_probe leaves ckdev->idev null, but cros_ec_keyb_process passes it to input_event. Reachability requires Chrome EC input hardware to deliver the unexpected event; Siemens also confirms affected RUGGEDCOM RST2428P firmware before V4.0, while the event's origin remains unknown.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in the Linux cros_ec_keyb driver allows local users to crash the kernel through a malformed EC key-matrix event. In a buttons-and-switches-only configuration, cros_ec_keyb_probe leaves ckdev->idev null, but cros_ec_keyb_process passes it to input_event. Reachability requires Chrome EC input hardware to deliver the unexpected event; Siemens also confirms affected RUGGEDCOM RST2428P firmware before V4.0, while the event's origin remains unknown.

The record

CVE
CVE-2025-40263
Published
Dec 4, 2025
Updated
Jun 2, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 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=5.19
  2. Affected versionversion=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <2d251c15c27e2dd16d6318425d2f7260cbd47d39
  3. Affected versionversion=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <6d81068685154535af06163eb585d6d9663ec7ec
  4. Affected versionversion=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <9cf59f4724a9ee06ebb06c76b8678ac322e850b7
  5. Affected versionversion=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <d74864291cb8bd784d44d1d02e87109cf88666bb
  6. Affected versionversion=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <e08969c4d65ac31297fcb4d31d4808c789152f68

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <2d251c15c27e2dd16d6318425d2f7260cbd47d39; version=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <6d81068685154535af06163eb585d6d9663ec7ec; version=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <9cf59f4724a9ee06ebb06c76b8678ac322e850b7; version=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <d74864291cb8bd784d44d1d02e87109cf88666bb; version=ca1eadbfcd36bec73f2a2111c28e8c7e9e8ae6c0 <e08969c4d65ac31297fcb4d31d4808c789152f68
Siemens · RUGGEDCOM RST2428Pversion=0 <V4.0

Published CVSS scores

5.5Siemens ProductCERTCVSS: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.

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

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

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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