hwmon: (pmbus) Fix passing events to regulator core

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72395
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:13 UTC
Updated2026-08-17 06:19:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus) Fix passing events to regulator core Sashiko reports: Commit 754bd2b4a084 ("hwmon: (pmbus/core) Protect regulator operations with mutex") introduced a worker to batch regulator events over time using atomic_or(). The delayed worker then passes the combined bitmask unmodified to regulator_notifier_call_chain(). The core regulator subsystem's regulator_handle_critical() function evaluates the event parameter using a strict switch statement. If multiple distinct faults occur before the worker runs (e.g., REGULATOR_EVENT_UNDER_VOLTAGE | REGULATOR_EVENT_OVER_CURRENT), the combined bitmask fails to match any case. This leaves the reason as NULL and completely bypasses the critical hw_protection_trigger(). Fix the problem by passing events bit by bit to the regulator event handler.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

EPSS: 0.001690000 probability, percentile 0.066800000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b26849cffaa7c43355b82e9bef3725e786973a1a 2106bf4056858fcce3624e0c51f6fee4d41d3f2f git Not specified
CNA Linux Linux affected acf04e2863132f6d9222f71f3a76fb9782cbe061 48fe43666950efefb7ac5fbdc012c1b3604096bf git Not specified
CNA Linux Linux affected 4e9d723d9f198b86f6882a84c501ba1f39e8d055 489291b6b56978cc50d34e8e13f9636ea296ba8a git Not specified
CNA Linux Linux affected 754bd2b4a084b90b5e7b630e1f423061a9b9b761 b0ff6b6ae9c5183ef701ece7016698bde5a5bfba git Not specified
CNA Linux Linux affected 754bd2b4a084b90b5e7b630e1f423061a9b9b761 9ef7dacd44216bf5ea05c8aef49eba4d145f4047 git Not specified
CNA Linux Linux affected 2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07 git Not specified
CNA Linux Linux affected 6.6.143 6.6.145 semver Not specified
CNA Linux Linux affected 6.12.92 6.12.97 semver Not specified
CNA Linux Linux affected 6.18.21 6.18.40 semver Not specified
CNA Linux Linux affected 6.19.11 6.20 semver Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2106bf4056858fcce3624e0c51f6fee4d41d3f2f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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