GHSA-GH23-6P4G-C667
Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-07 21:30In 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.
{
"affected": [],
"aliases": [
"CVE-2026-31741"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-01T15:16:36Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncounter: rz-mtu3-cnt: prevent counter from being toggled multiple times\n\nRuntime PM counter is incremented / decremented each time the sysfs\nenable file is written to.\n\nIf user writes 0 to the sysfs enable file multiple times, runtime PM\nusage count underflows, generating the following message.\n\nrz-mtu3-counter rz-mtu3-counter.0: Runtime PM usage count underflow!\n\nAt the same time, hardware registers end up being accessed with clocks\noff in rz_mtu3_terminate_counter() to disable an already disabled\nchannel.\n\nIf user writes 1 to the sysfs enable file multiple times, runtime PM\nusage count will be incremented each time, requiring the same number of\n0 writes to get it back to 0.\n\nIf user writes 0 to the sysfs enable file while PWM is in progress, PWM\nis stopped without counter being the owner of the underlying MTU3\nchannel.\n\nCheck against the cached count_is_enabled value and exit if the user\nis trying to set the same enable value.",
"id": "GHSA-gh23-6p4g-c667",
"modified": "2026-05-07T21:30:24Z",
"published": "2026-05-01T15:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31741"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/67c3f99bed6f422ba343d2b70a2eeeccdfd91bef"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/885aa739a07ab45e90dfa997205acec97979ce4e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ced8b48420eddb1251f93c22dc23fa136490b3cd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e07237df8538b0ae98dce112e4f6db093d767f80"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f5f6f06d7e6d262026578b59ba7426eb04acce5d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.