Vulnerability-Lookup

FKIE_CVE-2021-47500

Vulnerability from fkie_nvd - Published: 2024-05-24 15:15 - Updated: 2026-08-04 10:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96	Patch

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	5.15
linux	linux_kernel	5.15
linux	linux_kernel	5.15
linux	linux_kernel	5.15

JSON

To clipboard

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      "affectedData": [
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          "product": "Linux",
          "programFiles": [
            "drivers/iio/accel/mma8452.c"
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              "version": "5.16",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: mma8452: Fix trigger reference couting\n\nThe mma8452 driver directly assigns a trigger to the struct iio_dev. The\nIIO core when done using this trigger will call `iio_trigger_put()` to drop\nthe reference count by 1.\n\nWithout the matching `iio_trigger_get()` in the driver the reference count\ncan reach 0 too early, the trigger gets freed while still in use and a\nuse-after-free occurs.\n\nFix this by getting a reference to the trigger before assigning it to the\nIIO device."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iio: mma8452: correcci\u00f3n del c\u00e1lculo de referencia del disparador El controlador mma8452 asigna directamente un disparador a la estructura iio_dev. El n\u00facleo de IIO, cuando termine de usar este activador, llamar\u00e1 a `iio_trigger_put()` para reducir el recuento de referencias en 1. Sin el `iio_trigger_get()` coincidente en el controlador, el recuento de referencias puede llegar a 0 demasiado pronto, el activador se libera mientras a\u00fan est\u00e1 en se produce un uso y un use-after-free. Solucione este problema obteniendo una referencia al disparador antes de asignarlo al dispositivo IIO."
    }
  ],
  "id": "CVE-2021-47500",
  "lastModified": "2026-08-04T10:17:06.060",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
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          "baseScore": 7.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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          "baseScore": 7.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
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            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T15:35:45.977945Z",
          "version": "2.0.3"
        }
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  "published": "2024-05-24T15:15:09.900",
  "references": [
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
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      "source": "nvd@nist.gov",
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  ]
}

CVE-2021-47500 (GCVE-0-2021-47500)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:01 – Updated: 2026-08-05 08:48

Title

iio: mma8452: Fix trigger reference couting

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 15:35 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/094d513b78b171411…
https://git.kernel.org/stable/c/fb75cc4740d81264c…
https://git.kernel.org/stable/c/794c0898f6bf39a45…
https://git.kernel.org/stable/c/f5deab10ced368c80…
https://git.kernel.org/stable/c/acf0088ac073ca6e7…
https://git.kernel.org/stable/c/db12d95085367de8b…
https://git.kernel.org/stable/c/c43517071dfc9fce3…
https://git.kernel.org/stable/c/cd0082235783f8142…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ae6d9ce05691bf79694074db7c7da980080548af , < 094d513b78b1714113bc016684b8142382e071ba (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < fb75cc4740d81264cd5bcb0e17d961d018a8be96 (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < 794c0898f6bf39a458655d5fb4af70ec43a5cfcb (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < f5deab10ced368c807866283f8b79144c4823be8 (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < acf0088ac073ca6e7f4cad6acac112177e08df5e (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < db12d95085367de8b0223929d1332731024441f1 (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < c43517071dfc9fce34f8f69dbb98a86017f6b739 (git) Affected: ae6d9ce05691bf79694074db7c7da980080548af , < cd0082235783f814241a1c9483fb89e405f4f892 (git)
Linux	Linux	Affected: 4.2 Unaffected: 0 , < 4.2 (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)

Show details on NVD website

JSON

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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.

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