CVE-2025-23134 (GCVE-0-2025-23134)
Vulnerability from cvelistv5 – Published: 2025-04-16 14:13 – Updated: 2026-05-11 21:13
VLAI
EPSS
VEX
Title
ALSA: timer: Don't take register_mutex with copy_from/to_user()
Summary
In the Linux kernel, the following vulnerability has been resolved:
ALSA: timer: Don't take register_mutex with copy_from/to_user()
The infamous mmap_lock taken in copy_from/to_user() can be often
problematic when it's called inside another mutex, as they might lead
to deadlocks.
In the case of ALSA timer code, the bad pattern is with
guard(mutex)(®ister_mutex) that covers copy_from/to_user() -- which
was mistakenly introduced at converting to guard(), and it had been
carefully worked around in the past.
This patch fixes those pieces simply by moving copy_from/to_user() out
of the register mutex lock again.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 16:15 UTC
CWE
- CWE-667 - Improper Locking
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3923de04c81733b30b8ed667569632272fdfed9a , < 15291b561d8cc835a2eea76b394070cf8e072771
(git)
Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < 296f7a9e15aab276db11206cbc1e2ae1215d7862 (git) Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < b074f47e55df93832bbbca1b524c501e6fea1c0d (git) Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < 3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6 (git) |
guessed | |
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.23 , ≤ 6.12.* (semver) Unaffected: 6.13.11 , ≤ 6.13.* (semver) Unaffected: 6.14.2 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix) |
guessed |
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"versionEndExcluding": "6.15",
"versionStartIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: Don\u0027t take register_mutex with copy_from/to_user()\n\nThe infamous mmap_lock taken in copy_from/to_user() can be often\nproblematic when it\u0027s called inside another mutex, as they might lead\nto deadlocks.\n\nIn the case of ALSA timer code, the bad pattern is with\nguard(mutex)(\u0026register_mutex) that covers copy_from/to_user() -- which\nwas mistakenly introduced at converting to guard(), and it had been\ncarefully worked around in the past.\n\nThis patch fixes those pieces simply by moving copy_from/to_user() out\nof the register mutex lock again."
}
],
"providerMetadata": {
"dateUpdated": "2025-05-26T05:19:12.614Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/15291b561d8cc835a2eea76b394070cf8e072771"
},
{
"url": "https://git.kernel.org/stable/c/296f7a9e15aab276db11206cbc1e2ae1215d7862"
},
{
"url": "https://git.kernel.org/stable/c/b074f47e55df93832bbbca1b524c501e6fea1c0d"
},
{
"url": "https://git.kernel.org/stable/c/3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6"
}
],
"title": "ALSA: timer: Don\u0027t take register_mutex with copy_from/to_user()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-23134",
"datePublished": "2025-04-16T14:13:15.144Z",
"dateReserved": "2025-01-11T14:28:41.511Z",
"dateUpdated": "2025-10-01T16:15:15.661Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- 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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.