CVE-2026-74547

Local denial of service via zero-delay update loop

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in Linux hwmon adt7470 allows local users to exhaust CPU and flood the I2C bus through writable sysfs controls. The auto_update_interval_store() path accepts zero, so schedule_timeout_interruptible(0) returns immediately while adt7470_read_temperatures() also sleeps for zero when num_temp_sensors is zero. An accessible ADT7470 device and both zero-valued controls are required; the resulting loop consumes CPU and continuously transacts on the I2C bus without crashing the kernel.

CVSS severity5.5
Medium
EPSS probability0.18%
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 Linux hwmon adt7470 allows local users to exhaust CPU and flood the I2C bus through writable sysfs controls. The auto_update_interval_store() path accepts zero, so schedule_timeout_interruptible(0) returns immediately while adt7470_read_temperatures() also sleeps for zero when num_temp_sensors is zero. An accessible ADT7470 device and both zero-valued controls are required; the resulting loop consumes CPU and continuously transacts on the I2C bus without crashing the kernel.

The record

CVE
CVE-2026-74547
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1050, T1499.004
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=2.6.29
  2. Affected versionversion=89fac11cb3e7c5860c425dba14845c09ccede39d <1a42bd72a66205e439db1d1142442b62d393408a
  3. Affected versionversion=89fac11cb3e7c5860c425dba14845c09ccede39d <38e6b5ce5794ff09442231cc171c2be5e900bab3
  4. Affected versionversion=89fac11cb3e7c5860c425dba14845c09ccede39d <5ea299c3aa42a827f6a863eeead6de3525bbb17a
  5. Affected versionversion=89fac11cb3e7c5860c425dba14845c09ccede39d <82d65f7ef11edcea0228745440b8b4b1f222c34c
  6. Affected versionversion=89fac11cb3e7c5860c425dba14845c09ccede39d <cb0b7f9c43b0abbd422a7e4c2c85e91db429207c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.29; version=89fac11cb3e7c5860c425dba14845c09ccede39d <1a42bd72a66205e439db1d1142442b62d393408a; version=89fac11cb3e7c5860c425dba14845c09ccede39d <38e6b5ce5794ff09442231cc171c2be5e900bab3; version=89fac11cb3e7c5860c425dba14845c09ccede39d <5ea299c3aa42a827f6a863eeead6de3525bbb17a; version=89fac11cb3e7c5860c425dba14845c09ccede39d <82d65f7ef11edcea0228745440b8b4b1f222c34c; version=89fac11cb3e7c5860c425dba14845c09ccede39d <cb0b7f9c43b0abbd422a7e4c2c85e91db429207c

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS: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

CWE-1050Excessive Platform Resource Consumption within a Loop
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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