CVE-2026-90311Hinoki check available

Removal hang via retained shared hwmon device

Published Sep 17, 2026 · Updated Sep 17, 2026

A removal hang in Linux thermal hwmon allows local users to block thermal-zone teardown by unbinding the ACPI thermal driver. In drivers/thermal/thermal_hwmon.c, thermal_remove_hwmon_sysfs() retains the shared hwmon device when another same-type zone still has an attribute beneath it, preventing its parent zone from completing removal. The trigger requires multiple same-type thermal zones and access to remove the parent zone; the documented consequence is stalled teardown, not a system crash or data disclosure.

CVSS severity1.9
Low
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A removal hang in Linux thermal hwmon allows local users to block thermal-zone teardown by unbinding the ACPI thermal driver. In drivers/thermal/thermal_hwmon.c, thermal_remove_hwmon_sysfs() retains the shared hwmon device when another same-type zone still has an attribute beneath it, preventing its parent zone from completing removal. The trigger requires multiple same-type thermal zones and access to remove the parent zone; the documented consequence is stalled teardown, not a system crash or data disclosure.

The record

CVE
CVE-2026-90311
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=4.19
  2. Affected versionversion=f6b6b52ef7a54160c0a4d2b56a58f84a2e5b33c5 <2b57e24d34b2dfc43c81942bb359d6315bf302fb
  3. Affected versionversion=f6b6b52ef7a54160c0a4d2b56a58f84a2e5b33c5 <4fa8915f40f744c6db2a3c25b2ae7d2dd64c77b4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=f6b6b52ef7a54160c0a4d2b56a58f84a2e5b33c5 <2b57e24d34b2dfc43c81942bb359d6315bf302fb; version=f6b6b52ef7a54160c0a4d2b56a58f84a2e5b33c5 <4fa8915f40f744c6db2a3c25b2ae7d2dd64c77b4

Published CVSS scores

1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
7.8TenableCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2TenableAV:L/AC:L/Au:N/C:C/I:C/A:C

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application 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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