CVE-2026-74547: Linux kernel · hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in cb0b7f9c43b0abbd422a7e4c2c85e91db429207c : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:56 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in cb0b7f9c43b0abbd422a7e4c2c85e91db429207c, 1325975a2eab265510e6036d8bf0c0068373d332, 82d65f7ef11edcea0228745440b8b4b1f222c34c +5
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix is available and has been applied in the Linux kernel. The fix enforces a minimum 500 millisecond delay between sensor updates, preventing the busy-loop and I2C flooding. Users should update to a Linux kernel version that includes the fix commits identified in the established facts.
Description
CVE-2026-74547 is a vulnerability in the Linux kernel's hwmon driver for the adt7470 sensor. When userspace sets the 'auto_update_interval' to 0 and 'num_temp_sensors' to 0, the background update thread enters a tight busy-loop, causing high CPU usage and flooding the I2C bus with continuous transactions. This can lead to denial of service on the I2C bus. The issue is fixed by enforcing a minimum 500 millisecond sleep interval between sensor updates.
References
- git.kernel.org/stable/c/2c4c4d7cadd10b50b5489183bbbb9eb95f6f8344 (opens in a new tab)
- git.kernel.org/stable/c/4dc1518f9cc57c6db99514cafeb02dd7117d5bda (opens in a new tab)
- git.kernel.org/stable/c/1325975a2eab265510e6036d8bf0c0068373d332 (opens in a new tab)
- git.kernel.org/stable/c/1a42bd72a66205e439db1d1142442b62d393408a (opens in a new tab)
- git.kernel.org/stable/c/38e6b5ce5794ff09442231cc171c2be5e900bab3 (opens in a new tab)
- git.kernel.org/stable/c/82d65f7ef11edcea0228745440b8b4b1f222c34c (opens in a new tab)
- git.kernel.org/stable/c/5ea299c3aa42a827f6a863eeead6de3525bbb17a (opens in a new tab)
- git.kernel.org/stable/c/cb0b7f9c43b0abbd422a7e4c2c85e91db429207c (opens in a new tab)