{"id":"CVE-2021-47327","state":"PUBLISHED","title":"iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails","description":"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.","publishedAt":"2024-05-21T14:35:39.816Z","updatedAt":"2026-05-11T13:52:20.041Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","status":"affected","lessThan":"3761ae0d0e549f2acdaf11f49df4ed06d256b20f","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","status":"affected","lessThan":"c4007596fbdabc29f858dc2e1990858a146b60b2","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","status":"affected","lessThan":"fbf4daa6f4105e01fbd3868006f65c163365c1e3","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","status":"affected","lessThan":"fe92c058199067ae90cf2a901ddf3c271893557a","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","status":"affected","lessThan":"1adf30f198c26539a62d761e45af72cde570413d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/arm/arm-smmu/arm-smmu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.4.134","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.52","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.19","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13.4","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/arm/arm-smmu/arm-smmu.c"]}],"references":["https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f","https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2","https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3","https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a","https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d"],"weaknesses":["CWE-911"],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47327.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47327","state":"PUBLISHED","datePublished":"2024-05-21T14:35:39.816Z","dateUpdated":"2026-05-11T13:52:20.041Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:28:16.975Z"},"containers":{"cna":{"title":"iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails","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. 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