CVE-2026-23094

Local denial of service via missing uacce callbacks

Published Feb 4, 2026 · Updated Feb 4, 2026

Denial of service in the Linux Kernel uacce driver allows local users to crash the system through isolation-policy sysfs access. The isolate threshold sysfs handlers call isolate_err_threshold_read or isolate_err_threshold_write even when the selected callback is absent. Exploitation requires low-privileged local access, an exposed uacce device, and a driver implementing only the opposite callback; the consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.12%
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 Kernel uacce driver allows local users to crash the system through isolation-policy sysfs access. The isolate threshold sysfs handlers call isolate_err_threshold_read or isolate_err_threshold_write even when the selected callback is absent. Exploitation requires low-privileged local access, an exposed uacce device, and a driver implementing only the opposite callback; the consequence is a system crash.

The record

CVE
CVE-2026-23094
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=6.3
  2. Affected versionversion=e3e289fbc0b520cf469469e8cdba84a50424eb65 <82821a681d5dcce31475a65190fc39ea8f372cc0
  3. Affected versionversion=e3e289fbc0b520cf469469e8cdba84a50424eb65 <98eec349259b1fd876f350b1c600403bcef8f85d
  4. Affected versionversion=e3e289fbc0b520cf469469e8cdba84a50424eb65 <9ab05cdcac354b1b1139918f49c6418b9005d042
  5. Affected versionversion=e3e289fbc0b520cf469469e8cdba84a50424eb65 <fdbbb47d15ae17bf39fafec7e2028c1f8efba15e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.3; version=e3e289fbc0b520cf469469e8cdba84a50424eb65 <82821a681d5dcce31475a65190fc39ea8f372cc0; version=e3e289fbc0b520cf469469e8cdba84a50424eb65 <98eec349259b1fd876f350b1c600403bcef8f85d; version=e3e289fbc0b520cf469469e8cdba84a50424eb65 <9ab05cdcac354b1b1139918f49c6418b9005d042; version=e3e289fbc0b520cf469469e8cdba84a50424eb65 <fdbbb47d15ae17bf39fafec7e2028c1f8efba15e

Published CVSS scores

0.0Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5UbuntuCVSS: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 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.

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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