CVE-2025-68367

Kernel warning via concurrent mac-hid sysctl writes

Published Dec 24, 2025 · Updated Dec 24, 2025

Race condition in the mac-hid subsystem of Linux allows local users to trigger a kernel warning through concurrent sysctl writes. mac_hid_toggle_emumouse reads old_val before taking its mutex, so concurrent writers each register the same input handler and double-add its list node. Triggering the condition requires root access to the sysctl; the demonstrated consequence is a kernel warning, not a documented crash or code execution.

CVSS severityUnavailable
Unscored
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

Race condition in the mac-hid subsystem of Linux allows local users to trigger a kernel warning through concurrent sysctl writes. mac_hid_toggle_emumouse reads old_val before taking its mutex, so concurrent writers each register the same input handler and double-add its list node. Triggering the condition requires root access to the sysctl; the demonstrated consequence is a kernel warning, not a documented crash or code execution.

The record

CVE
CVE-2025-68367
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=2.6.34
  2. Affected versionversion=99b089c3c38a83ebaeb1cc4584ddcde841626467 <1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f
  3. Affected versionversion=99b089c3c38a83ebaeb1cc4584ddcde841626467 <230621ffdb361d15cd3ef92d8b4fa8d314f4fad4
  4. Affected versionversion=99b089c3c38a83ebaeb1cc4584ddcde841626467 <388391dd1cc567fcf0b372b63d414c119d23e911
  5. Affected versionversion=99b089c3c38a83ebaeb1cc4584ddcde841626467 <48a7d427eb65922b3f17fbe00e2bbc7cb9eac381

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=99b089c3c38a83ebaeb1cc4584ddcde841626467 <1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f; version=99b089c3c38a83ebaeb1cc4584ddcde841626467 <230621ffdb361d15cd3ef92d8b4fa8d314f4fad4; version=99b089c3c38a83ebaeb1cc4584ddcde841626467 <388391dd1cc567fcf0b372b63d414c119d23e911; version=99b089c3c38a83ebaeb1cc4584ddcde841626467 <48a7d427eb65922b3f17fbe00e2bbc7cb9eac381

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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