CVE-2025-40125

Kernel warning via invalid sysfs object deletion

Published Nov 12, 2025 · Updated May 11, 2026

Improper cleanup in affected Linux kernel branches allows attackers to trigger a kernel warning through block queue reconfiguration. In blk_mq_unregister_hctx, kobject_del runs unconditionally after blk_mq_sysfs_register_hctxs fails, so deletion targets an hctx kobject never added to sysfs. The condition requires a failed hctx sysfs creation followed by an administrative hardware-queue count change or disk removal; published evidence confirms a warning, not a crash or broader compromise.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper cleanup in affected Linux kernel branches allows attackers to trigger a kernel warning through block queue reconfiguration. In blk_mq_unregister_hctx, kobject_del runs unconditionally after blk_mq_sysfs_register_hctxs fails, so deletion targets an hctx kobject never added to sysfs. The condition requires a failed hctx sysfs creation followed by an administrative hardware-queue count change or disk removal; published evidence confirms a warning, not a crash or broader compromise.

The record

CVE
CVE-2025-40125
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.20
  2. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <06c4826b1d900611096e4621e93133db57e13911
  3. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <4b97e99b87a773d52699521d40864f3ec888e9a6
  4. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed
  5. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <6e7dadc5763c48eb3b9b91265a21f312599ebb2c
  6. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <a8c53553f1833cc2d14175d2d72cf37193a01898
  7. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <babc634e9fe2803962dba98a07587e835dbc0731
  8. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <cc14ea21c4e658814d737ed4dedde6cd626a15ad
  9. Affected versionversion=477e19dedc9d3e1f4443a1d4ae00572a988120ea <d5ddd76ee52bdc16e9f8b1e7791291e785dab032

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <06c4826b1d900611096e4621e93133db57e13911; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <4b97e99b87a773d52699521d40864f3ec888e9a6; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <4c7ef92f6d4d08a27d676e4c348f4e2922cab3ed; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <6e7dadc5763c48eb3b9b91265a21f312599ebb2c; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <a8c53553f1833cc2d14175d2d72cf37193a01898; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <babc634e9fe2803962dba98a07587e835dbc0731; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <cc14ea21c4e658814d737ed4dedde6cd626a15ad; version=477e19dedc9d3e1f4443a1d4ae00572a988120ea <d5ddd76ee52bdc16e9f8b1e7791291e785dab032

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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