counter: rz-mtu3-cnt: prevent counter from being toggled multiple times

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Summary

CVECVE-2026-31741
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:36 UTC
Updated2026-05-07 19:55:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: counter: rz-mtu3-cnt: prevent counter from being toggled multiple times Runtime PM counter is incremented / decremented each time the sysfs enable file is written to. If user writes 0 to the sysfs enable file multiple times, runtime PM usage count underflows, generating the following message. rz-mtu3-counter rz-mtu3-counter.0: Runtime PM usage count underflow! At the same time, hardware registers end up being accessed with clocks off in rz_mtu3_terminate_counter() to disable an already disabled channel. If user writes 1 to the sysfs enable file multiple times, runtime PM usage count will be incremented each time, requiring the same number of 0 writes to get it back to 0. If user writes 0 to the sysfs enable file while PWM is in progress, PWM is stopped without counter being the owner of the underlying MTU3 channel. Check against the cached count_is_enabled value and exit if the user is trying to set the same enable value.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000180000 probability, percentile 0.048290000 (date 2026-05-05)

Problem Types: NVD-CWE-Other

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 885aa739a07ab45e90dfa997205acec97979ce4e git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a ced8b48420eddb1251f93c22dc23fa136490b3cd git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a e07237df8538b0ae98dce112e4f6db093d767f80 git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a f5f6f06d7e6d262026578b59ba7426eb04acce5d git Not specified
CNA Linux Linux affected 0be8907359df4c62319f5cb2c6981ff0d9ebf35a 67c3f99bed6f422ba343d2b70a2eeeccdfd91bef git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/67c3f99bed6f422ba343d2b70a2eeeccdfd91bef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f5f6f06d7e6d262026578b59ba7426eb04acce5d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ced8b48420eddb1251f93c22dc23fa136490b3cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e07237df8538b0ae98dce112e4f6db093d767f80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/885aa739a07ab45e90dfa997205acec97979ce4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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