Medium · CVSS 5.5CVE-2026-64213

hwmon: (lm90) Add lock protection to lm90_alertCVE-2026-64213

Answer in brief

CVE-2026-64213 records a Medium severity (CVSS 5.5) vulnerability in hwmon: (lm90) Add lock protection to lm90_alert. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 24, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Aug 12, 2026Material review Oct 21, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 6 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc1::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc2::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:7.1:rc3::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=7a1d220ccb0cc2b808eb176fb05bf55a38179f3f <02b88fa993582b4fe228b4143b330b0bb9f28353 \|\| >=7a1d220ccb0cc2b808eb176fb05bf55a38179f3f <165ef777ec6f634a5e4b8d9b0dadca8ef91fa90e \|\| >=7a1d220ccb0cc2b808eb176fb05bf55a38179f3f <bed1fc32e0eb653806fa98afcf55f9a311fc4ce2 \|\| >=7a1d220ccb0cc2b808eb176fb05bf55a38179f3f <b0b66aae8a94c3663d47e4000b0e81b89ce32186 \|\| >=7a1d220ccb0cc2b808eb176fb05bf55a38179f3f <873e919e3101063a7a75989510ccfc125a4391cf	02b88fa993582b4fe228b4143b330b0bb9f28353, 165ef777ec6f634a5e4b8d9b0dadca8ef91fa90e, bed1fc32e0eb653806fa98afcf55f9a311fc4ce2, b0b66aae8a94c3663d47e4000b0e81b89ce32186, 873e919e3101063a7a75989510ccfc125a4391cf
Linux/Linuxgeneric	5.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 02b88fa993582b4fe228b4143b330b0bb9f28353 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Add lock protection to lm90_alert Sashiko reports: lm90_alert() executes in the smbus alert context and calls lm90_update_confreg() to disable the hardware alert line, without acquiring hwmon_lock. Concurrently, sysfs write operations (such as lm90_write_convrate) hold the hwmon_lock, temporarily modify data->config, and then restore it. If an alert interrupt occurs concurrently with a sysfs write, the sysfs path will overwrite the alert handler's modifications to data->config and the hardware register. This unintentionally re-enables the hardware alert line while the alarm is still active, causing an interrupt storm. Add the missing lock to lm90_alert() to solve the problem.

Quoted source text, attributed separately from HOL analysis.