FKIE_CVE-2021-47509

Vulnerability from fkie_nvd - Published: 2024-05-24 15:15 - Updated: 2025-09-29 16:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Limit the period size to 16MB Set the practical limit to the period size (the fragment shift in OSS) instead of a full 31bit; a too large value could lead to the exhaust of memory as we allocate temporary buffers of the period size, too. As of this patch, we set to 16MB limit, which should cover all use cases.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bccPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2e54cf6794bf82a54aaefc78da13819aea9cd28aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/35a3e511032146941085f87dd9fb5b82ea5c00a2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/76f19e4cbb548e28547f8c328aa0bfb3a10222d3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ad45babf7886e7a212ee1d5eda9ef49f696db43cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b02a41eebcc36d4f07196780f2e165ca2c499257Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/be55f306396cd62c6889286a7194fd8b53363aebPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d1bb703ad050de9095f10b2d3416c32921ac6bccPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.16
linux linux_kernel 5.16
linux linux_kernel 5.16
linux linux_kernel 5.16
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: oss: Limit the period size to 16MB\n\nSet the practical limit to the period size (the fragment shift in OSS)\ninstead of a full 31bit; a too large value could lead to the exhaust\nof memory as we allocate temporary buffers of the period size, too.\n\nAs of this patch, we set to 16MB limit, which should cover all use\ncases."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: pcm: oss: Limitar el tama\u00f1o del per\u00edodo a 16 MB Establezca el l\u00edmite pr\u00e1ctico para el tama\u00f1o del per\u00edodo (el desplazamiento de fragmentos en OSS) en lugar de 31 bits completos; un valor demasiado grande podr\u00eda provocar el agotamiento de la memoria, ya que tambi\u00e9n asignamos b\u00faferes temporales del tama\u00f1o del per\u00edodo. A partir de este parche, establecimos un l\u00edmite de 16 MB, que deber\u00eda cubrir todos los casos de uso."
    }
  ],
  "id": "CVE-2021-47509",
  "lastModified": "2025-09-29T16:30:22.197",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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  "published": "2024-05-24T15:15:11.780",
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  "vulnStatus": "Analyzed",
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      "source": "nvd@nist.gov",
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}


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  • 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.
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  • 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.