ALSA: timer: Forcibly close timer instances at closing_CVE-2026-53193

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-25T08:39:04.346Z",
    "modified": "2026-06-28T06:40:11.908Z",
    "type": "cve",
    "title": "ALSA: timer: Forcibly close timer instances at closing",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/586b219a22b1032b28b8bd356b963276c5e5bf53\nhttps://git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92\nhttps://git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f\nhttps://git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92",
    "id": "CVE-2026-53193",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 37745918e0e7575bc40f38da93a99b9fa6406224\nLinux Linux 37745918e0e7575bc40f38da93a99b9fa6406224\nLinux Linux 37745918e0e7575bc40f38da93a99b9fa6406224\nLinux Linux 37745918e0e7575bc40f38da93a99b9fa6406224\nLinux Linux 6.12",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
    "vendor": "Linux",
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    "ai_score": 0
}