CVE-2026-93084 (GCVE-0-2026-93084)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-10-30 12:35
VLAI
Title
firmware: arm_scmi: Drop handle on protocol bind failures
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Drop handle on protocol bind failures The SCMI bus notifier acquires an SCMI handle when the driver core emits BUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe callback. The protocol probe path only checks whether sdev->handle is set. If device_link_add() fails after the handle has been acquired, the protocol device can still bind with a valid handle but without the dependency link to the SCMI parent. A concurrent parent unbind can then miss the child and tear down the SCMI instance while the child still holds a handle into it. If the protocol driver probe later fails, for example with -EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather than BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the handle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind leaked the SCMI instance users refcount and left sdev->handle set after the failed probe. Make the link helper report failure and drop the acquired handle if the link cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the same cleanup path used for unbind so failed probes balance the earlier BUS_NOTIFY_BIND_DRIVER acquisition.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6846 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b50c9270304cfed6ee1c4ce5036102ad7b762051 , < b5377e690cd4fe87ee52fcf067c9929414ea8f4e (git)
Affected: 971fc0665f1361f23251e4d85fac4aed1b683505 , < 0f860db24ee95e5da4866303a35e55098b9641b3 (git)
Affected: 971fc0665f1361f23251e4d85fac4aed1b683505 , < df273eced7cec550465fd1bb82a5d2c3c7d3c437 (git)
Affected: 971fc0665f1361f23251e4d85fac4aed1b683505 , < a54dc23e8bd2246c28eafffa60b4634f0d1a11cc (git)
Affected: 971fc0665f1361f23251e4d85fac4aed1b683505 , < 77d2985d1e80e67f32026fc03e975c4c83cc543d (git)
Affected: 971fc0665f1361f23251e4d85fac4aed1b683505 , < e3a5c30d233ca5d3e799a80da806554c703bda13 (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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      "current_release_date": "2026-10-20T12:49:21+00:00",
      "cve": "CVE-2026-93084",
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      "id": "CVE-2026-93084",
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      "title": "SUSE CVE CVE-2026-93084",
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}



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