CVE-2021-47327 (GCVE-0-2021-47327)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI
Title
iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the refcount of the "smmu" even though the return value is less than 0. The reference counting issue happens in some error handling paths of arm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get() fails, the caller functions forget to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak. Fix this issue by calling pm_runtime_resume_and_get() instead of pm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount balanced in case of failure.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-911 - Improper Update of Reference Count
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d4a44f0750bb9bf7c44c22444a482756b2344a79 , < 3761ae0d0e549f2acdaf11f49df4ed06d256b20f (git)
Affected: d4a44f0750bb9bf7c44c22444a482756b2344a79 , < c4007596fbdabc29f858dc2e1990858a146b60b2 (git)
Affected: d4a44f0750bb9bf7c44c22444a482756b2344a79 , < fbf4daa6f4105e01fbd3868006f65c163365c1e3 (git)
Affected: d4a44f0750bb9bf7c44c22444a482756b2344a79 , < fe92c058199067ae90cf2a901ddf3c271893557a (git)
Affected: d4a44f0750bb9bf7c44c22444a482756b2344a79 , < 1adf30f198c26539a62d761e45af72cde570413d (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.134 , ≤ 5.4.* (semver)
Unaffected: 5.10.52 , ≤ 5.10.* (semver)
Unaffected: 5.12.19 , ≤ 5.12.* (semver)
Unaffected: 5.13.4 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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linux linux_kernel Affected: 1da177e4c3f4 , < 3761ae0d0e54 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < c4007596fbda (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < fbf4daa6f410 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < fe92c0581990 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Affected: 1da177e4c3f4 , < 1adf30f198c2 (custom)
    cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.4.134 , ≤ 5.5 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.10.52 , ≤ 5.11 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.12.19 , ≤ 5.13 (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
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linux linux_kernel Unaffected: 5.13.4 , ≤ 5.14 (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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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47327\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:19.757\",\"lastModified\":\"2026-06-17T04:17:12.227\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\niommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails\\n\\narm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the\\nrefcount of the \\\"smmu\\\" even though the return value is less than 0.\\n\\nThe reference counting issue happens in some error handling paths of\\narm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get()\\nfails, the caller functions forget to decrease the refcount of \\\"smmu\\\"\\nincreased by arm_smmu_rpm_get(), causing a refcount leak.\\n\\nFix this issue by calling pm_runtime_resume_and_get() instead of\\npm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount\\nbalanced in case of failure.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommu/arm-smmu: corrige la fuga de refcount de arm_smmu_device cuando falla arm_smmu_rpm_get arm_smmu_rpm_get() invoca pm_runtime_get_sync(), lo que aumenta el refcount de \\\"smmu\\\" aunque el valor de retorno sea menor que 0. El problema del conteo de referencias ocurre en algunas rutas de manejo de errores de arm_smmu_rpm_get() en sus funciones de llamada. Cuando arm_smmu_rpm_get() falla, las funciones de la persona que llama se olvidan de disminuir el recuento de \\\"smmu\\\" aumentado en arm_smmu_rpm_get(), lo que provoca una fuga de recuento. Solucione este problema llamando a pm_runtime_resume_and_get() en lugar de pm_runtime_get_sync() en arm_smmu_rpm_get(), lo que puede mantener el recuento equilibrado en caso de 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:40:14+00:00",
      "cve": "CVE-2021-47327",
      "id": "CVE-2021-47327",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47327.json",
      "version": "3"
    },
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

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  • 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.