VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-93084: Linux kernel · firmware: arm_scmi: Drop handle on protocol bind failures

Source GCVE Database

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Authoritative record:CVE-2026-93084· Medium

Not known to be exploited · fixed in e3a5c30d233ca5d3e799a80da806554c703bda13 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:18 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in e3a5c30d233ca5d3e799a80da806554c703bda13, df273eced7cec550465fd1bb82a5d2c3c7d3c437, b5377e690cd4fe87ee52fcf067c9929414ea8f4e +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-mw9p-h9xr-r672

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 971fc0665f1361f23251e4d85fac4aed1b683505, < e3a5c30d233ca5d3e799a80da806554c703bda13	Fixed in e3a5c30d233ca5d3e799a80da806554c703bda13
LinuxLinux	Affected ≥ 971fc0665f1361f23251e4d85fac4aed1b683505, < df273eced7cec550465fd1bb82a5d2c3c7d3c437	Fixed in df273eced7cec550465fd1bb82a5d2c3c7d3c437
LinuxLinux	Affected ≥ b50c9270304cfed6ee1c4ce5036102ad7b762051, < b5377e690cd4fe87ee52fcf067c9929414ea8f4e	Fixed in b5377e690cd4fe87ee52fcf067c9929414ea8f4e
LinuxLinux	Affected ≥ 971fc0665f1361f23251e4d85fac4aed1b683505, < a54dc23e8bd2246c28eafffa60b4634f0d1a11cc	Fixed in a54dc23e8bd2246c28eafffa60b4634f0d1a11cc
LinuxLinux	Affected ≥ 971fc0665f1361f23251e4d85fac4aed1b683505, < 77d2985d1e80e67f32026fc03e975c4c83cc543d	Fixed in 77d2985d1e80e67f32026fc03e975c4c83cc543d
LinuxLinux	Affected ≥ 971fc0665f1361f23251e4d85fac4aed1b683505, < 0f860db24ee95e5da4866303a35e55098b9641b3	Fixed in 0f860db24ee95e5da4866303a35e55098b9641b3

AI-suggested

A fix has been implemented in the Linux kernel to properly drop SCMI handles on protocol bind failures and to handle driver not bound notifications correctly. Users should update to the kernel version containing this fix once available. No additional mitigation is required beyond applying the official patch.

Description

A vulnerability in the Linux kernel's arm_scmi firmware component was addressed involving improper handle management during protocol bind failures. The issue allowed SCMI handles to be leaked when device_link_add() failed, potentially causing resource leaks and inconsistent state due to missed dependency links. The fix ensures that handles are dropped properly on bind failures and that cleanup occurs on driver not bound notifications.

Impact

This vulnerability could lead to resource leaks in the SCMI subsystem of the Linux kernel and inconsistent device state due to missing dependency links. While no direct exploitation or active attacks are reported, the issue could cause instability or unexpected behavior in systems relying on the arm_scmi firmware interface.

Summary

The Linux kernel's arm_scmi subsystem had a flaw where the SCMI bus notifier acquired a handle on BUS_NOTIFY_BIND_DRIVER but did not release it if device_link_add() failed, leaving sdev->handle set despite a failed probe. This could cause the protocol device to bind without a proper dependency link, risking teardown of the SCMI instance while still referenced by the child. Additionally, failed protocol driver probes emitting BUS_NOTIFY_DRIVER_NOT_BOUND did not trigger handle release, causing reference count leaks. The patch modifies the link helper to report failure and drop handles if link creation fails and handles BUS_NOTIFY_DRIVER_NOT_BOUND in the same cleanup path as unbind events, preventing resource leaks and inconsistent states.

References

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