CVE-2021-47282 (GCVE-0-2021-47282)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:20 – Updated: 2026-05-11 13:51
VLAI
Title
spi: bcm2835: Fix out-of-bounds access with more than 4 slaves
Summary
In the Linux kernel, the following vulnerability has been resolved: spi: bcm2835: Fix out-of-bounds access with more than 4 slaves Commit 571e31fa60b3 ("spi: bcm2835: Cache CS register value for ->prepare_message()") limited the number of slaves to 3 at compile-time. The limitation was necessitated by a statically-sized array prepare_cs[] in the driver private data which contains a per-slave register value. The commit sought to enforce the limitation at run-time by setting the controller's num_chipselect to 3: Slaves with a higher chipselect are rejected by spi_add_device(). However the commit neglected that num_chipselect only limits the number of *native* chipselects. If GPIO chipselects are specified in the device tree for more than 3 slaves, num_chipselect is silently raised by of_spi_get_gpio_numbers() and the result are out-of-bounds accesses to the statically-sized array prepare_cs[]. As a bandaid fix which is backportable to stable, raise the number of allowed slaves to 24 (which "ought to be enough for anybody"), enforce the limitation on slave ->setup and revert num_chipselect to 3 (which is the number of native chipselects supported by the controller). An upcoming for-next commit will allow an arbitrary number of slaves.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 571e31fa60b3697d5db26140e16d5c45c51c9815 , < b5502580cf958b094f3b69dfe4eece90eae01fbc (git)
Affected: 571e31fa60b3697d5db26140e16d5c45c51c9815 , < 82a8ffba54d31e97582051cb56ba1f988018681e (git)
Affected: 571e31fa60b3697d5db26140e16d5c45c51c9815 , < 01415ff85a24308059e06ca3e97fd7bf75648690 (git)
Affected: 571e31fa60b3697d5db26140e16d5c45c51c9815 , < 13817d466eb8713a1ffd254f537402f091d48444 (git)
Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.126 , ≤ 5.4.* (semver)
Unaffected: 5.10.44 , ≤ 5.10.* (semver)
Unaffected: 5.12.11 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T11:51:43+00:00",
      "cve": "CVE-2021-47282",
      "id": "CVE-2021-47282",
      "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: spi: bcm2835: Fix out-of-bounds access with more than 4 slaves",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47282.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T17:34:36Z",
      "cve": "CVE-2021-47282",
      "id": "CVE-2021-47282",
      "initial_release_date": "2024-05-23T03:05:04Z",
      "product_status:known_not_affected": "330",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47282",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47282.json",
      "version": "18"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47282\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T05:32:08.008Z\", \"dateReserved\": \"2024-05-21T13:27:52.128Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:20:08.155Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.





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.