CVE-2026-74552

Kernel crash via uninitialized alarm device pointer

Published Aug 15, 2026 · Updated Aug 15, 2026

NULL pointer dereference in the Linux lm90 hwmon driver allows local users to crash the system by racing a sysfs read during registration. The alarm path schedules report_work before data->hwmon_dev is initialized, and lm90_report_alarms passes that NULL pointer to hwmon_notify_event(). Exploitation requires local access, the lm90 driver, and precise timing during device registration; the bounded consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.17%
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 Linux lm90 hwmon driver allows local users to crash the system by racing a sysfs read during registration. The alarm path schedules report_work before data->hwmon_dev is initialized, and lm90_report_alarms passes that NULL pointer to hwmon_notify_event(). Exploitation requires local access, the lm90 driver, and precise timing during device registration; the bounded consequence is a kernel crash.

The record

CVE
CVE-2026-74552
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-824, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.0
  2. Affected versionversion=f6d0775119fb905fb02eafa98d575cf8ee792d46 <075fce376cf852db9293481edce07c181a9b1f46
  3. Affected versionversion=f6d0775119fb905fb02eafa98d575cf8ee792d46 <4eed33c7db5c0c573928d28d8a2c003642c679b8
  4. Affected versionversion=f6d0775119fb905fb02eafa98d575cf8ee792d46 <70d9a71aa407044d70b50d356b6decf6659c4d56
  5. Affected versionversion=f6d0775119fb905fb02eafa98d575cf8ee792d46 <aa9429edf9fc0e90d6f4da19ea4b5495a54ab117
  6. Affected versionversion=f6d0775119fb905fb02eafa98d575cf8ee792d46 <f0b791a006512a48b6348494cb6960598fa99a58

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=f6d0775119fb905fb02eafa98d575cf8ee792d46 <075fce376cf852db9293481edce07c181a9b1f46; version=f6d0775119fb905fb02eafa98d575cf8ee792d46 <4eed33c7db5c0c573928d28d8a2c003642c679b8; version=f6d0775119fb905fb02eafa98d575cf8ee792d46 <70d9a71aa407044d70b50d356b6decf6659c4d56; version=f6d0775119fb905fb02eafa98d575cf8ee792d46 <aa9429edf9fc0e90d6f4da19ea4b5495a54ab117; version=f6d0775119fb905fb02eafa98d575cf8ee792d46 <f0b791a006512a48b6348494cb6960598fa99a58

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS: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.

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

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

CWE-824Access of Uninitialized Pointer
T1499Endpoint Denial of Service

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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