firmware: arm_scmi: Fix SCMI device destroy lifetimes

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Summary

CVECVE-2026-93081
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:02 UTC
Updated2026-09-17 17:18:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix SCMI device destroy lifetimes scmi_child_dev_find() drops the reference returned by device_find_child() before returning the scmi_device pointer. A concurrent unregister can then release the device while the destroy path is still using the returned pointer. Make the lookup helper return the device_find_child() reference and keep it until scmi_device_destroy() has finished unregistering the child. Also split device_unregister() in __scmi_device_destroy() so the SCMI bus ID is not made reusable until after device_del() has removed the old scmi_dev.N name from sysfs. This avoids a new SCMI device reusing the same ID while the old device is still registered. The final device release callback is also a possible cleanup path when SCMI children are deleted by driver core recursion rather than __scmi_device_destroy(). Release the SCMI bus ID from a common helper used by destroy, register-failure and final-release paths, and clear scmi_dev->id after freeing it so the final release cannot free the same ID again.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.088390000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9ca67840c0ddf3f39407339624cef824a4f27599 c59b3393df1348a12308aaabd5fbc58ed6b21cf5 git Not specified
CNA Linux Linux affected 9ca67840c0ddf3f39407339624cef824a4f27599 6abe8fe36b29ff51d1a42c2f338972883f4751a5 git Not specified
CNA Linux Linux affected 91ff1e9652fb9beb0174267d6bb38243dff211bb git Not specified
CNA Linux Linux affected ff4273d47da81b95ed9396110bcbd1b7b7470fe8 git Not specified
CNA Linux Linux affected 2fbf6c9695ad9f05e7e5c166bf43fac7cb3276b3 git Not specified
CNA Linux Linux affected 969d8beaa2e374387bf9aa5602ef84fc50bb48d8 git Not specified
CNA Linux Linux affected 8a8a3547d5c4960da053df49c75bf623827a25da git Not specified
CNA Linux Linux affected 5.15.182 5.16 semver Not specified
CNA Linux Linux affected 6.1.138 6.2 semver Not specified
CNA Linux Linux affected 6.6.90 6.7 semver Not specified
CNA Linux Linux affected 6.12.28 6.13 semver Not specified
CNA Linux Linux affected 6.14.6 6.15 semver Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c59b3393df1348a12308aaabd5fbc58ed6b21cf5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6abe8fe36b29ff51d1a42c2f338972883f4751a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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