CVE-2026-64038: hwmon: (lm90) Stop work before releasing hwmon device

mediumCVSS 5.5CVE-2026-64038

CSIRTS triage

Other

What: The hwmon device may not stop work before being released.
Who is affected: Deployments using the hwmon device.
Urgency: Remediation is medium urgency due to the medium severity of the issue.
Action: Apply the patch for CVE-2026-64038.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64038

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-640380.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64038	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highUSN-8618-1: Linux kernel vulnerabilitiesubuntu
highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
highUSN-8593-1: Linux kernel vulnerabilitiesubuntu
unknownCVE-2026-64038: In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Stop work be…nvd

Recent advisories for hwmon

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-64213: In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Add lock pro…nvd · 2026-07-24
unknownCVE-2026-64135: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) wid…nvd · 2026-07-19
unknownCVE-2026-64087: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) rej…nvd · 2026-07-19
highCVE-2026-64086: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) inc…nvd · 2026-07-19
unknownCVE-2026-64085: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) bou…nvd · 2026-07-19
highCVE-2026-64084: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) cap…nvd · 2026-07-19