CVE-2026-93084
Vulnérabilité non évaluée dans Linux (Linux)
Description
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.
Gravité et risque d'exploitation
CVE-2026-93084 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 10.4 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.12.*, 0, <0f860db24ee95e5da4866303a35e55098b9641b3, <df273eced7cec550465fd1bb82a5d2c3c7d3c437, <e3a5c30d233ca5d3e799a80da806554c703bda13, 6.18.52, <6.3, <77d2985d1e80e67f32026fc03e975c4c83cc543d, <=6.6.*, 6.6.157, 6.3, 971fc0665f1361f23251e4d85fac4aed1b683505, 7.2.6, <=6.18.*, <=7.2.*, 6.12.110, <=*, <a54dc23e8bd2246c28eafffa60b4634f0d1a11cc, 7.3) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://git.kernel.org/stable/c/0f860db24ee95e5da4866303a35e55098b9641b3
- https://git.kernel.org/stable/c/df273eced7cec550465fd1bb82a5d2c3c7d3c437
- https://git.kernel.org/stable/c/a54dc23e8bd2246c28eafffa60b4634f0d1a11cc
- https://git.kernel.org/stable/c/77d2985d1e80e67f32026fc03e975c4c83cc543d
- https://git.kernel.org/stable/c/e3a5c30d233ca5d3e799a80da806554c703bda13