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GHSA-GXG5-6XG7-GC7Q

Vulnerability from github – Published: 2025-04-16 15:34 – Updated: 2025-04-29 21:31

Details

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)(&register_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)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-23134"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-16T15:16:07Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-gxg5-6xg7-gc7q",
  "modified": "2025-04-29T21:31:48Z",
  "published": "2025-04-16T15:34:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23134"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15291b561d8cc835a2eea76b394070cf8e072771"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/296f7a9e15aab276db11206cbc1e2ae1215d7862"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b074f47e55df93832bbbca1b524c501e6fea1c0d"
    }
  ],
  "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"
    }
  ]
}

CVE-2025-23134 (GCVE-0-2025-23134)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:13 – Updated: 2026-05-11 21:13

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)(&register_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)


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

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

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6856 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/15291b561d8cc835a…
https://git.kernel.org/stable/c/296f7a9e15aab276d…
https://git.kernel.org/stable/c/b074f47e55df93832…
https://git.kernel.org/stable/c/3424c8f53bc63c877…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < 15291b561d8cc835a2eea76b394070cf8e072771 (git) Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < 296f7a9e15aab276db11206cbc1e2ae1215d7862 (git) Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < b074f47e55df93832bbbca1b524c501e6fea1c0d (git) Affected: 3923de04c81733b30b8ed667569632272fdfed9a , < 3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6 (git)
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)

Show details on NVD website

JSON

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        "metrics": [
          {
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              "attackComplexity": "LOW",
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              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
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              "scope": "UNCHANGED",
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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.

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