CVE-2025-68335Public exploit

Kernel crash via uninitialized Comedi async pointer

Published Dec 22, 2025 · Updated Dec 22, 2025

NULL pointer dereference in the Comedi PCL818 driver in affected Linux kernels allows local users to crash the kernel during device detach. On early pcl818_detach(), pcl818_ai_cancel() dereferences s->async->cmd even when read_subdev never received a comedi_async object. Reachability requires local ioctl access to detach a PCL818 Comedi device; the demonstrated consequence is a general protection fault and kernel crash.

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

NULL pointer dereference in the Comedi PCL818 driver in affected Linux kernels allows local users to crash the kernel during device detach. On early pcl818_detach(), pcl818_ai_cancel() dereferences s->async->cmd even when read_subdev never received a comedi_async object. Reachability requires local ioctl access to detach a PCL818 Comedi device; the demonstrated consequence is a general protection fault and kernel crash.

The record

CVE
CVE-2025-68335
Published
Dec 22, 2025
Updated
Dec 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 22, 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=00aba6e7b5653a6607238ecdab7172318059d984 <5caa40e7c6a43e08e3574f990865127705c22861
  2. Affected versionversion=00aba6e7b5653a6607238ecdab7172318059d984 <877adccfacb32687b90714a27cfb09f444fdfa16
  3. Affected versionversion=00aba6e7b5653a6607238ecdab7172318059d984 <a51f025b5038abd3d22eed2ede4cd46793d89565
  4. Affected versionversion=00aba6e7b5653a6607238ecdab7172318059d984 <d948c53dec36dafe182631457597c49c1f1df5ea
  5. Affected versionversion=3.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=00aba6e7b5653a6607238ecdab7172318059d984 <5caa40e7c6a43e08e3574f990865127705c22861; version=00aba6e7b5653a6607238ecdab7172318059d984 <877adccfacb32687b90714a27cfb09f444fdfa16; version=00aba6e7b5653a6607238ecdab7172318059d984 <a51f025b5038abd3d22eed2ede4cd46793d89565; version=00aba6e7b5653a6607238ecdab7172318059d984 <d948c53dec36dafe182631457597c49c1f1df5ea; version=3.15

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 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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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