Vulnerability-Lookup

GHSA-JMF6-3V74-7X28

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

ALSA: timer: Fix UAF at snd_timer_user_params()

At releasing a timer object, e.g. when a userspace timer (CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it tries to detach the timer instances and release the resources. However, it's still possible that other in-flight tasks are holding the timer instance where the to-be-deleted timer object is associated, and this may lead to racy accesses.

Fortunately, most of ioctls dealing with the timer instance list already have the protection with register_mutex, and this also avoids such races. But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the concurrent ioctl may lead to use-after-free.

This patch just adds the guard with register_mutex to protect snd_timer_user_params() for covering the code path as a quick workaround. It's no hot-path but rather a rarely issued ioctl, so the performance penalty doesn't matter.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53192"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:36Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: Fix UAF at snd_timer_user_params()\n\nAt releasing a timer object, e.g. when a userspace timer\n(CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it\ntries to detach the timer instances and release the resources.\nHowever, it\u0027s still possible that other in-flight tasks are holding\nthe timer instance where the to-be-deleted timer object is associated,\nand this may lead to racy accesses.\n\nFortunately, most of ioctls dealing with the timer instance list\nalready have the protection with register_mutex, and this also avoids\nsuch races.  But, SNDRV_TIMER_IOCTL_PARAMS isn\u0027t protected, hence the\nconcurrent ioctl may lead to use-after-free.\n\nThis patch just adds the guard with register_mutex to protect\nsnd_timer_user_params() for covering the code path as a quick\nworkaround.  It\u0027s no hot-path but rather a rarely issued ioctl, so the\nperformance penalty doesn\u0027t matter.",
  "id": "GHSA-jmf6-3v74-7x28",
  "modified": "2026-06-28T09:31:43Z",
  "published": "2026-06-25T09:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53192"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/117743d62e1225e208568a3ffc2c07214f1347cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/306427adf9b97e29e5958cb9cf3096c6151fc9ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38034d04d4a75bbca01df2b313ced0bcd0fa3242"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d39da65b5c422c5e5afb7d5651b0698d060a827"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92ad2d7f80cad43b046f093e808e11fe919d304a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2214914e461d0466548a52dfe4f4ee8ce362276"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2331730175f74169046d2af8db1b47243df7c7a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53192 (GCVE-0-2026-53192)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:33

Title

ALSA: timer: Fix UAF at snd_timer_user_params()

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Fix UAF at snd_timer_user_params() At releasing a timer object, e.g. when a userspace timer (CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it tries to detach the timer instances and release the resources. However, it's still possible that other in-flight tasks are holding the timer instance where the to-be-deleted timer object is associated, and this may lead to racy accesses. Fortunately, most of ioctls dealing with the timer instance list already have the protection with register_mutex, and this also avoids such races. But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the concurrent ioctl may lead to use-after-free. This patch just adds the guard with register_mutex to protect snd_timer_user_params() for covering the code path as a quick workaround. It's no hot-path but rather a rarely issued ioctl, so the performance penalty doesn't matter.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/38034d04d4a75bbca…
https://git.kernel.org/stable/c/3d39da65b5c422c5e…
https://git.kernel.org/stable/c/306427adf9b97e29e…
https://git.kernel.org/stable/c/053a401b592be424f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 38034d04d4a75bbca01df2b313ced0bcd0fa3242 (git) Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 3d39da65b5c422c5e5afb7d5651b0698d060a827 (git) Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 306427adf9b97e29e5958cb9cf3096c6151fc9ff (git) Affected: 37745918e0e7575bc40f38da93a99b9fa6406224 , < 053a401b592be424fea9d57c789f66cd5d8cec11 (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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          "defaultStatus": "unaffected",
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          "programFiles": [
            "sound/core/timer.c"
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          "vendor": "Linux",
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              "versionType": "git"
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              "status": "affected",
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              "version": "0",
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          "nodes": [
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                },
                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: Fix UAF at snd_timer_user_params()\n\nAt releasing a timer object, e.g. when a userspace timer\n(CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it\ntries to detach the timer instances and release the resources.\nHowever, it\u0027s still possible that other in-flight tasks are holding\nthe timer instance where the to-be-deleted timer object is associated,\nand this may lead to racy accesses.\n\nFortunately, most of ioctls dealing with the timer instance list\nalready have the protection with register_mutex, and this also avoids\nsuch races.  But, SNDRV_TIMER_IOCTL_PARAMS isn\u0027t protected, hence the\nconcurrent ioctl may lead to use-after-free.\n\nThis patch just adds the guard with register_mutex to protect\nsnd_timer_user_params() for covering the code path as a quick\nworkaround.  It\u0027s no hot-path but rather a rarely issued ioctl, so the\nperformance penalty doesn\u0027t matter."
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            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:58.587Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11"
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      "title": "ALSA: timer: Fix UAF at snd_timer_user_params()",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2026-53192",
    "datePublished": "2026-06-25T08:39:03.696Z",
    "dateReserved": "2026-06-09T07:44:35.390Z",
    "dateUpdated": "2026-08-05T12:33:58.587Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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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.

Detection rules are retrieved from Rulezet.

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.

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