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CVE-2021-47348 (GCVE-0-2021-47348)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI
Title
drm/amd/display: Avoid HDCP over-read and corruption
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid HDCP over-read and corruption Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-15 13:22 UTC
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4c283fdac08abf3211533f70623c90a34f41d08d , < c5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2e (git)
Affected: 4c283fdac08abf3211533f70623c90a34f41d08d , < 44c7c901cb368a9f2493748f213b247b5872639f (git)
Affected: 4c283fdac08abf3211533f70623c90a34f41d08d , < 3b2b93a485fb7a970bc8b5daef16f4cf579d172f (git)
Affected: 4c283fdac08abf3211533f70623c90a34f41d08d , < 06888d571b513cbfc0b41949948def6cb81021b2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.51 , ≤ 5.10.* (semver)
Unaffected: 5.12.18 , ≤ 5.12.* (semver)
Unaffected: 5.13.3 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4 , < c5b518f4b98d (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4 , < 44c7c901cb36 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4 , < 3b2b93a485fb (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4 , < 06888d571b51 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.14
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.10.51 , ≤ 5.11 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.12.18 , ≤ 5.13 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.13.3 , ≤ 5,14 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-02-02T10:48:41+00:00",
      "cve": "CVE-2021-47348",
      "id": "CVE-2021-47348",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amd/display: Avoid HDCP over-read and corruption",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47348.json",
      "version": "3"
    },
    "vulnrichment": {
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This could result in a corrupted value if the\\ntrailing 3 bytes were non-zero, so instead use an appropriately sized\\nand zero-initialized bounce buffer, and read only 5 bytes before casting\\nto u64.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.51\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.18\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.3\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-15T12:14:05.400Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47348\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-09-15T12:14:05.400Z\", \"dateReserved\": \"2024-05-21T14:28:16.983Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:53.613Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.