CVE-2026-93081: Linux Vulnerability

Description

In 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.

Metrics

EPSS Probability

0.20%

9.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= ff4273d47da81b95ed9396110bcbd1b7b7470fe8, < afe5c022a180e0ade394d3fffbafc1a701f50993; >= 2fbf6c9695ad9f05e7e5c166bf43fac7cb3276b3, < d8ecdceeb90cd2c265b222a7b65487faf68fea73; >= 969d8beaa2e374387bf9aa5602ef84fc50bb48d8, < 916e27f71a80f6d77c48d1a1a5782d6d5ef9017c; >= 9ca67840c0ddf3f39407339624cef824a4f27599, < a60bc2df2d323cc1342f0cf95563cae266801e20; >= 9ca67840c0ddf3f39407339624cef824a4f27599, < c59b3393df1348a12308aaabd5fbc58ed6b21cf5; >= 9ca67840c0ddf3f39407339624cef824a4f27599, < 6abe8fe36b29ff51d1a42c2f338972883f4751a5; 91ff1e9652fb9beb0174267d6bb38243dff211bb; 8a8a3547d5c4960da053df49c75bf623827a25da; >= 6.1.138, < 6.1.191; >= 6.6.90, < 6.6.160; >= 6.12.28, < 6.12.114; >= 5.15.182, < 5.16; >= 6.14.6, < 6.15
Linux	Linux	6.15

References

Timeline

Published: Sep 17, 2026
Last Modified: Oct 30, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-93081?

In 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.

How severe is CVE-2026-93081?

Severity scoring for CVE-2026-93081 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2026-93081?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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