firmware: arm_scmi: Quiesce notifications before teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93091
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:03 UTC
Updated2026-10-19 10:16:58 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Quiesce notifications before teardown scmi_notification_exit() clears and releases the notification instance, but transport callbacks can still deliver incoming notifications until the TX/RX channels are freed. During remove, an RX interrupt in that window can enter scmi_notify() while notification state is being torn down and then dereference freed memory. The same ordering exists on the probe error path after notification initialization. The notification late-init worker has a separate lifetime issue: protocol event registration queues ni->init_work on the system workqueue, so destroying ni->notify_wq does not drain that work. If the devres group is released while init_work is still pending or running, the late-init worker can dereference the freed notification instance. Quiesce the notification core before TX/RX channels are torn down, then clean up the channels before releasing the notification core resources. Use disable_work_sync() so future late-init queueing is rejected and any already queued or running late-init work has completed before channel teardown starts.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.064890000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1e7cbfaa66d39e78bd24df0c78b55df68176b59e 6778bcabd2e0c32f73476f0bc6369013692540be git Not specified
CNA Linux Linux affected 1e7cbfaa66d39e78bd24df0c78b55df68176b59e 2aac23bc0a79af41104d99823bb250fae92ba144 git Not specified
CNA Linux Linux affected 1e7cbfaa66d39e78bd24df0c78b55df68176b59e 5e30d3d16d1a9e599be4dcea872874e65e2c277b git Not specified
CNA Linux Linux affected 1e7cbfaa66d39e78bd24df0c78b55df68176b59e 8e49055d0d495c9c07575ad8e111d9eaf0efb13f git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8e49055d0d495c9c07575ad8e111d9eaf0efb13f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6778bcabd2e0c32f73476f0bc6369013692540be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e30d3d16d1a9e599be4dcea872874e65e2c277b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2aac23bc0a79af41104d99823bb250fae92ba144 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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