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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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      "cve": "CVE-2021-47281",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Fix race of snd_seq_timer_open()\n\nThe timer instance per queue is exclusive, and snd_seq_timer_open()\nshould have managed the concurrent accesses.  It looks as if it's\nchecking the already existing timer instance at the beginning, but\nit's not right, because there is no protection, hence any later\nconcurrent call of snd_seq_timer_open() may override the timer\ninstance easily.  This may result in UAF, as the leftover timer\ninstance can keep running while the queue itself gets closed, as\nspotted by syzkaller recently.\n\nFor avoiding the race, add a proper check at the assignment of\ntmr->timeri again, and return -EBUSY if it's been already registered.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47281"
        },
        {
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          "summary": "https://git.kernel.org/stable/c/536a7646c00a0f14fee49e5e313109e5da2f6031",
          "url": "https://git.kernel.org/stable/c/536a7646c00a0f14fee49e5e313109e5da2f6031"
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          "summary": "https://git.kernel.org/stable/c/83e197a8414c0ba545e7e3916ce05f836f349273",
          "url": "https://git.kernel.org/stable/c/83e197a8414c0ba545e7e3916ce05f836f349273"
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          "summary": "https://git.kernel.org/stable/c/bd7d88b0874f82f7b29d1a53e574cedaf23166ba",
          "url": "https://git.kernel.org/stable/c/bd7d88b0874f82f7b29d1a53e574cedaf23166ba"
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      "release_date": "2024-05-21T15:15:00",
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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