CVE-2025-40031

Kernel crash via partial page extraction

Published Oct 28, 2025 · Updated Oct 28, 2025

NULL pointer dereference in the Linux kernel TEE subsystem allows local users to crash the kernel through malformed shared-memory registration. register_shm_helper() accepts a short positive result from iov_iter_extract_pages() as complete, leaving missing page entries that later reach a NULL dereference. The path requires local access to TEE_IOC_SHM_REGISTER and a partly unmapped buffer; reaching it crashes the host rather than exposing data.

CVSS severity7.0
High
EPSS probability0.20%
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 kernel TEE subsystem allows local users to crash the kernel through malformed shared-memory registration. register_shm_helper() accepts a short positive result from iov_iter_extract_pages() as complete, leaving missing page entries that later reach a NULL dereference. The path requires local access to TEE_IOC_SHM_REGISTER and a partly unmapped buffer; reaching it crashes the host rather than exposing data.

The record

CVE
CVE-2025-40031
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2025Record 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=6.8
  2. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <6a7874ab814ce12003c46a92f7afc9b035c8e8e9
  3. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <9338093db954918558677a468d32e77041c65167
  4. Affected versionversion=7bdee41575919773818e525ea19e54eb817770af <d5cf5b37064b1699d946e8b7ab4ac7d7d101814c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=7bdee41575919773818e525ea19e54eb817770af <6a7874ab814ce12003c46a92f7afc9b035c8e8e9; version=7bdee41575919773818e525ea19e54eb817770af <9338093db954918558677a468d32e77041c65167; version=7bdee41575919773818e525ea19e54eb817770af <d5cf5b37064b1699d946e8b7ab4ac7d7d101814c

Published CVSS scores

7.0CISA-ADPCVSS:3.1/AV:L/AC:H/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

T1499.004Endpoint Denial of Service: Application 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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Your stack

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