{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53193",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53193"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "ALSA: timer: Forcibly close timer instances at closing",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: Forcibly close timer instances at closing\n\nWhen snd_timer object is freed via snd_timer_free() and still pending\nsnd_timer_instance objects are assigned to the timer object, it tries\nto unlink all instances and just set NULL to each ti->timer, then\nreleases the resources immediately.  The problem is, however, when\nthere are slave timer instances that are associated with a master\ninstance linked to this timer: namely, those slave instances still\npoint to the freed timer object although the master instance is\nunlinked, which may lead to user-after-free.  The bug can be easily\ntriggered particularly when a new userspace-driven timers\n(CONFIG_SND_UTIMER) is involved, since it can create and delete the\ntimer object via a simple file open/close, while the other\napplications may keep accessing to that timer.\n\nThis patch is an attempt to paper over the problem above: now instead\nof just unlinking, call snd_timer_close[_locked]() forcibly for each\npending timer instance, so that all assigned slave timer instances are\nproperly detached, too.  Since snd_timer_close() might be called later\nby the driver that created that instance, the check of\nSNDRV_TIMER_IFLG_DEAD is added at the beginning, too.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53193"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/586b219a22b1032b28b8bd356b963276c5e5bf53"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable path is reached through local `/dev/snd/timer` opens and ALSA timer ioctls, including `SNDRV_TIMER_IOCTL_CREATE`, `SELECT`, and later access to retained timer instances.\nAC:L - The attacker can create the userspace-driven timer, bind matching master/slave timer instances, close the timer fd to free the object, and then access the stale slave instance without relying on uncontrollable conditions.\nPR:L - The code path has no capability checks, but it requires a local user able to open `/dev/snd/timer` and issue ioctls.\nUI:N - No victim action is required after the attacker has local access; the attacker controls all needed file descriptors and ioctls.\nS:U - The impact is within the kernel/local system security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - This is a kernel use-after-free of `struct snd_timer`; stale timer pointers can be dereferenced by later ioctls and may expose reclaimed kernel heap contents or enable broader memory disclosure.\nI:H - The stale timer pointer is used in paths that take locks and manipulate lists/callback-related state, making kernel heap corruption and control-flow-impacting exploitation defensible.\nA:H - At minimum, dereferencing and locking a freed kernel timer object can trigger a kernel oops, panic, or hang."
    }
  }
}