CVE-2025-40062

Kernel service interruption via Hisilicon QM double free

Published Oct 28, 2025 · Updated Oct 28, 2025

Double free in the Hisilicon QM debugfs code in Linux allows local users to interrupt kernel availability during device removal. If acc_diff_reg initialization fails, the probe path frees qm->debug.qm_diff_regs without clearing it, and the remove path frees the stale pointer again. Exploitation requires low-privileged local access and the initialization-failure and device-removal sequence; published evidence reports availability impact only.

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

Double free in the Hisilicon QM debugfs code in Linux allows local users to interrupt kernel availability during device removal. If acc_diff_reg initialization fails, the probe path frees qm->debug.qm_diff_regs without clearing it, and the remove path frees the stale pointer again. Exploitation requires low-privileged local access and the initialization-failure and device-removal sequence; published evidence reports availability impact only.

The record

CVE
CVE-2025-40062
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

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=6.10
  2. Affected versionversion=7fc8d9a525b5c3f8dfa5ed50901e764d8ede7e1e <1750f1ec143ebabdbdfa013668665c9d5042c430
  3. Affected versionversion=8be0913389718e8d27c4f1d4537b5e1b99ed7739 <7226a0650ad5705bd8d39a11be270fa21ed1e6a5
  4. Affected versionversion=8be0913389718e8d27c4f1d4537b5e1b99ed7739 <a87a21a56244b8f4eb357f6bad879247005bbe38
  5. Affected versionversion=8be0913389718e8d27c4f1d4537b5e1b99ed7739 <f0cafb02de883b3b413d34eb079c9680782a9cc1
  6. Affected versionversion=e0a2d2df9ba7bd6bd7e0a9b6a5e3894f7e8445b3
  7. Affected versionversion=eda60520cfe3aba9f088c68ebd5bcbca9fc6ac3c <a7836260d5121949ba734e840d42a86ab4a32fcc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=7fc8d9a525b5c3f8dfa5ed50901e764d8ede7e1e <1750f1ec143ebabdbdfa013668665c9d5042c430; version=8be0913389718e8d27c4f1d4537b5e1b99ed7739 <7226a0650ad5705bd8d39a11be270fa21ed1e6a5; version=8be0913389718e8d27c4f1d4537b5e1b99ed7739 <a87a21a56244b8f4eb357f6bad879247005bbe38; version=8be0913389718e8d27c4f1d4537b5e1b99ed7739 <f0cafb02de883b3b413d34eb079c9680782a9cc1; version=e0a2d2df9ba7bd6bd7e0a9b6a5e3894f7e8445b3; version=eda60520cfe3aba9f088c68ebd5bcbca9fc6ac3c <a7836260d5121949ba734e840d42a86ab4a32fcc

Published CVSS scores

5.5SUSECVSS: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

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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Your stack

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