hwmon: (lm90) Add lock protection to lm90_alert

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64213
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-24 16:16:48 UTC
Updated2026-07-24 16:16:48 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f bed1fc32e0eb653806fa98afcf55f9a311fc4ce2 git Not specified
CNA Linux Linux affected 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f b0b66aae8a94c3663d47e4000b0e81b89ce32186 git Not specified
CNA Linux Linux affected 7a1d220ccb0cc2b808eb176fb05bf55a38179f3f 873e919e3101063a7a75989510ccfc125a4391cf git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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