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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
VLAI
Title
iio: mma8452: Fix trigger reference couting
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.
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
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iio: mma8452: Fix trigger reference couting",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47500.json",
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      "product_status:known_not_affected": "70",
      "product_status:recommended": "685",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47500",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47500.json",
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no attacker-uncontrollable race or layout is required.\\nPR:L - Exploitation needs only ordinary local access to the IIO device/sysfs (commonly granted to sensor/iio groups on phones and embedded systems), not full root or init-namespace admin capabilities.\\nUI:N - The attacker performs the sysfs write or teardown themselves; no separate victim action is required.\\nS:U - The UAF corrupts kernel memory in the same privilege domain as the vulnerable driver and does not cross a VM, IOMMU, or other security authority boundary.\\nC:H - This is a use-after-free of struct iio_trigger; per kernel UAF guidance the attacker can reclaim the object and obtain arbitrary kernel read primitives.\\nI:H - The freed trigger contains ops and related function pointers, so heap reuse enables arbitrary write / control-flow hijacking and potential code execution.\\nA:H - Premature free of the still-registered trigger, or a subsequent NULL/invalid trigger poll from the IRQ path, can oops/panic the kernel.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"094d513b78b1714113bc016684b8142382e071ba\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"fb75cc4740d81264cd5bcb0e17d961d018a8be96\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"794c0898f6bf39a458655d5fb4af70ec43a5cfcb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"f5deab10ced368c807866283f8b79144c4823be8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"acf0088ac073ca6e7f4cad6acac112177e08df5e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"db12d95085367de8b0223929d1332731024441f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"c43517071dfc9fce34f8f69dbb98a86017f6b739\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ae6d9ce05691bf79694074db7c7da980080548af\", \"lessThan\": \"cd0082235783f814241a1c9483fb89e405f4f892\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/iio/accel/mma8452.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.295\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.293\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.165\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/iio/accel/mma8452.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba\"}, {\"url\": \"https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96\"}, {\"url\": \"https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb\"}, {\"url\": \"https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8\"}, {\"url\": \"https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e\"}, {\"url\": \"https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1\"}, {\"url\": \"https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739\"}, {\"url\": \"https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.295\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.293\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.258\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.221\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.165\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.85\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.8\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"4.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:48:07.024Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47500\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:48:07.024Z\", \"dateReserved\": \"2024-05-22T06:20:56.204Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:01:43.362Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


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.