CVE-2021-47509 (GCVE-0-2021-47509)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2025-12-18 11:37
VLAI?
Title
ALSA: pcm: oss: Limit the period size to 16MB
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.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d1bb703ad050de9095f10b2d3416c32921ac6bcc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b02a41eebcc36d4f07196780f2e165ca2c499257 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be55f306396cd62c6889286a7194fd8b53363aeb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2e54cf6794bf82a54aaefc78da13819aea9cd28a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 76f19e4cbb548e28547f8c328aa0bfb3a10222d3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ad45babf7886e7a212ee1d5eda9ef49f696db43c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 35a3e511032146941085f87dd9fb5b82ea5c00a2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.4.295 , ≤ 4.4.* (semver)
Unaffected: 4.9.293 , ≤ 4.9.* (semver)
Unaffected: 4.14.258 , ≤ 4.14.* (semver)
Unaffected: 4.19.221 , ≤ 4.19.* (semver)
Unaffected: 5.4.165 , ≤ 5.4.* (semver)
Unaffected: 5.10.85 , ≤ 5.10.* (semver)
Unaffected: 5.15.8 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.221\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.165\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.85\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-10T07:12:12.671Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47509\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-10T07:12:12.671Z\", \"dateReserved\": \"2024-05-24T15:02:54.823Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:25.349Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.