CVE-2025-68258

Task hang via unchecked encoder channel count

Published Dec 16, 2025 · Updated Dec 16, 2025

Denial of service in the Linux multiq3 driver allows local users to block tasks and attached devices through crafted channel counts. The multiq3_attach() function copies it->options[2] into s->n_chan without an upper bound, causing multiq3_encoder_reset() to loop over an excessive number of channels for minutes. Exploitation requires local low-privileged access to invoke open() or COMEDI_DEVCONFIG, and the bounded consequence is a prolonged task and device hang rather than a host crash or reboot.

CVSS severity5.5
Medium
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

Denial of service in the Linux multiq3 driver allows local users to block tasks and attached devices through crafted channel counts. The multiq3_attach() function copies it->options[2] into s->n_chan without an upper bound, causing multiq3_encoder_reset() to loop over an excessive number of channels for minutes. Exploitation requires local low-privileged access to invoke open() or COMEDI_DEVCONFIG, and the bounded consequence is a prolonged task and device hang rather than a host crash or reboot.

The record

CVE
CVE-2025-68258
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 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=2.6.30
  2. Affected versionversion=77e01cdbad5175f56027fd6fae00bd0fc175651a <543f4c380c2e1f35e60528df7cb54705cda7fee3
  3. Affected versionversion=77e01cdbad5175f56027fd6fae00bd0fc175651a <8952bc1973cd54158c35e06bfb8c29ace7375a48
  4. Affected versionversion=77e01cdbad5175f56027fd6fae00bd0fc175651a <8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3
  5. Affected versionversion=77e01cdbad5175f56027fd6fae00bd0fc175651a <f24c6e3a39fa355dabfb684c9ca82db579534e72

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=77e01cdbad5175f56027fd6fae00bd0fc175651a <543f4c380c2e1f35e60528df7cb54705cda7fee3; version=77e01cdbad5175f56027fd6fae00bd0fc175651a <8952bc1973cd54158c35e06bfb8c29ace7375a48; version=77e01cdbad5175f56027fd6fae00bd0fc175651a <8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3; version=77e01cdbad5175f56027fd6fae00bd0fc175651a <f24c6e3a39fa355dabfb684c9ca82db579534e72

Published CVSS scores

5.5Amazon LinuxCVSS: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.

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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
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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