{"api_version":"1","generated_at":"2026-09-21T14:28:10+00:00","cve":"CVE-2026-93084","urls":{"html":"https://cve.report/CVE-2026-93084","api":"https://cve.report/api/cve/CVE-2026-93084.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93084","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93084"},"summary":{"title":"firmware: arm_scmi: Drop handle on protocol bind failures","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Drop handle on protocol bind failures\n\nThe SCMI bus notifier acquires an SCMI handle when the driver core emits\nBUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe\ncallback. The protocol probe path only checks whether sdev->handle is\nset.\n\nIf device_link_add() fails after the handle has been acquired, the\nprotocol device can still bind with a valid handle but without the\ndependency link to the SCMI parent. A concurrent parent unbind can then\nmiss the child and tear down the SCMI instance while the child still\nholds a handle into it.\n\nIf the protocol driver probe later fails, for example with\n-EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather\nthan BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the\nhandle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind\nleaked the SCMI instance users refcount and left sdev->handle set after\nthe failed probe.\n\nMake the link helper report failure and drop the acquired handle if the\nlink cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the\nsame cleanup path used for unbind so failed probes balance the earlier\nBUS_NOTIFY_BIND_DRIVER acquisition.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:02","updated_at":"2026-09-17 17:18:02"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/df273eced7cec550465fd1bb82a5d2c3c7d3c437","name":"https://git.kernel.org/stable/c/df273eced7cec550465fd1bb82a5d2c3c7d3c437","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a54dc23e8bd2246c28eafffa60b4634f0d1a11cc","name":"https://git.kernel.org/stable/c/a54dc23e8bd2246c28eafffa60b4634f0d1a11cc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/77d2985d1e80e67f32026fc03e975c4c83cc543d","name":"https://git.kernel.org/stable/c/77d2985d1e80e67f32026fc03e975c4c83cc543d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e3a5c30d233ca5d3e799a80da806554c703bda13","name":"https://git.kernel.org/stable/c/e3a5c30d233ca5d3e799a80da806554c703bda13","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0f860db24ee95e5da4866303a35e55098b9641b3","name":"https://git.kernel.org/stable/c/0f860db24ee95e5da4866303a35e55098b9641b3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93084","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93084","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 971fc0665f1361f23251e4d85fac4aed1b683505 0f860db24ee95e5da4866303a35e55098b9641b3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 971fc0665f1361f23251e4d85fac4aed1b683505 df273eced7cec550465fd1bb82a5d2c3c7d3c437 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 971fc0665f1361f23251e4d85fac4aed1b683505 a54dc23e8bd2246c28eafffa60b4634f0d1a11cc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 971fc0665f1361f23251e4d85fac4aed1b683505 77d2985d1e80e67f32026fc03e975c4c83cc543d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 971fc0665f1361f23251e4d85fac4aed1b683505 e3a5c30d233ca5d3e799a80da806554c703bda13 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93084","cve":"CVE-2026-93084","epss":"0.001680000","percentile":"0.065040000","score_date":"2026-09-18","updated_at":"2026-09-19 00:06:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/firmware/arm_scmi/driver.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0f860db24ee95e5da4866303a35e55098b9641b3","status":"affected","version":"971fc0665f1361f23251e4d85fac4aed1b683505","versionType":"git"},{"lessThan":"df273eced7cec550465fd1bb82a5d2c3c7d3c437","status":"affected","version":"971fc0665f1361f23251e4d85fac4aed1b683505","versionType":"git"},{"lessThan":"a54dc23e8bd2246c28eafffa60b4634f0d1a11cc","status":"affected","version":"971fc0665f1361f23251e4d85fac4aed1b683505","versionType":"git"},{"lessThan":"77d2985d1e80e67f32026fc03e975c4c83cc543d","status":"affected","version":"971fc0665f1361f23251e4d85fac4aed1b683505","versionType":"git"},{"lessThan":"e3a5c30d233ca5d3e799a80da806554c703bda13","status":"affected","version":"971fc0665f1361f23251e4d85fac4aed1b683505","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/firmware/arm_scmi/driver.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Drop handle on protocol bind failures\n\nThe SCMI bus notifier acquires an SCMI handle when the driver core emits\nBUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe\ncallback. The protocol probe path only checks whether sdev->handle is\nset.\n\nIf device_link_add() fails after the handle has been acquired, the\nprotocol device can still bind with a valid handle but without the\ndependency link to the SCMI parent. A concurrent parent unbind can then\nmiss the child and tear down the SCMI instance while the child still\nholds a handle into it.\n\nIf the protocol driver probe later fails, for example with\n-EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather\nthan BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the\nhandle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind\nleaked the SCMI instance users refcount and left sdev->handle set after\nthe failed probe.\n\nMake the link helper report failure and drop the acquired handle if the\nlink cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the\nsame cleanup path used for unbind so failed probes balance the earlier\nBUS_NOTIFY_BIND_DRIVER acquisition."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:11:03.659Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0f860db24ee95e5da4866303a35e55098b9641b3"},{"url":"https://git.kernel.org/stable/c/df273eced7cec550465fd1bb82a5d2c3c7d3c437"},{"url":"https://git.kernel.org/stable/c/a54dc23e8bd2246c28eafffa60b4634f0d1a11cc"},{"url":"https://git.kernel.org/stable/c/77d2985d1e80e67f32026fc03e975c4c83cc543d"},{"url":"https://git.kernel.org/stable/c/e3a5c30d233ca5d3e799a80da806554c703bda13"}],"title":"firmware: arm_scmi: Drop handle on protocol bind failures","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93084","datePublished":"2026-09-17T16:11:03.659Z","dateReserved":"2026-09-17T15:57:05.662Z","dateUpdated":"2026-09-17T16:11:03.659Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:02","lastModifiedDate":"2026-09-17 17:18:02","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93084","Ordinal":"1","Title":"firmware: arm_scmi: Drop handle on protocol bind failures","CVE":"CVE-2026-93084","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93084","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Drop handle on protocol bind failures\n\nThe SCMI bus notifier acquires an SCMI handle when the driver core emits\nBUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe\ncallback. The protocol probe path only checks whether sdev->handle is\nset.\n\nIf device_link_add() fails after the handle has been acquired, the\nprotocol device can still bind with a valid handle but without the\ndependency link to the SCMI parent. A concurrent parent unbind can then\nmiss the child and tear down the SCMI instance while the child still\nholds a handle into it.\n\nIf the protocol driver probe later fails, for example with\n-EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather\nthan BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the\nhandle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind\nleaked the SCMI instance users refcount and left sdev->handle set after\nthe failed probe.\n\nMake the link helper report failure and drop the acquired handle if the\nlink cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the\nsame cleanup path used for unbind so failed probes balance the earlier\nBUS_NOTIFY_BIND_DRIVER acquisition.","Type":"Description","Title":"firmware: arm_scmi: Drop handle on protocol bind failures"}]}}}