GHSA-JMF6-3V74-7X28

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-28 09:31
VLAI
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": [],
    "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"
    }
  ]
}


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