{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47327","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.975Z","datePublished":"2024-05-21T14:35:39.816Z","dateUpdated":"2025-12-18T11:36:47.214Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-18T11:36:47.214Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/arm/arm-smmu/arm-smmu.c"],"versions":[{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","lessThan":"3761ae0d0e549f2acdaf11f49df4ed06d256b20f","status":"affected","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","lessThan":"c4007596fbdabc29f858dc2e1990858a146b60b2","status":"affected","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","lessThan":"fbf4daa6f4105e01fbd3868006f65c163365c1e3","status":"affected","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","lessThan":"fe92c058199067ae90cf2a901ddf3c271893557a","status":"affected","versionType":"git"},{"version":"d4a44f0750bb9bf7c44c22444a482756b2344a79","lessThan":"1adf30f198c26539a62d761e45af72cde570413d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/arm/arm-smmu/arm-smmu.c"],"versions":[{"version":"5.0","status":"affected"},{"version":"0","lessThan":"5.0","status":"unaffected","versionType":"semver"},{"version":"5.4.134","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.52","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.19","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.4","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.4.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.13.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f"},{"url":"https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2"},{"url":"https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3"},{"url":"https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a"},{"url":"https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d"}],"title":"iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-911","lang":"en","description":"CWE-911 Improper Update of Reference Count"}]}],"affected":[{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"1da177e4c3f4","status":"affected","lessThan":"3761ae0d0e54","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"1da177e4c3f4","status":"affected","lessThan":"c4007596fbda","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"1da177e4c3f4","status":"affected","lessThan":"fbf4daa6f410","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"1da177e4c3f4","status":"affected","lessThan":"fe92c0581990","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"1da177e4c3f4","status":"affected","lessThan":"1adf30f198c2","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"5.4.134","status":"unaffected","lessThanOrEqual":"5.5","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"5.10.52","status":"unaffected","lessThanOrEqual":"5.11","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"5.12.19","status":"unaffected","lessThanOrEqual":"5.13","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"5.13.4","status":"unaffected","lessThanOrEqual":"5.14","versionType":"custom"}]},{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"5.14","status":"unaffected"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.1,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-06-06T15:58:26.406963Z","id":"CVE-2021-47327","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-06T16:10:25.404Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:08.559Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d","tags":["x_transferred"]}]}]}}