{
  "cveId": "CVE-2021-47327",
  "url": "https://patchblox.com/security/cve/CVE-2021-47327",
  "summary": "CVE-2021-47327 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47327, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/arm-smmu: Fix arm_smmu_device refcount lea...",
  "description": "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 \u0022smmu\u0022 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 \u0022smmu\u0022 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.",
  "published": "2024-05-21T15:15:19Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00255,
  "epssPercentile": 0.17213,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47327",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47327",
      "released": "2024-05-21T15:15:19Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47327",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47327",
      "released": "2024-05-21T15:15:19Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47327",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47327",
      "released": "2024-05-21T15:15:19Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}