CVE-2026-93081
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.
How to fix
- Linux Linuxafe5c022a180e0ade394d3fffbafc1a701f50993, d8ecdceeb90cd2c265b222a7b65487faf68fea73, 916e27f71a80f6d77c48d1a1a5782d6d5ef9017c, a60bc2df2d323cc1342f0cf95563cae266801e20, c59b3393df1348a12308aaabd5fbc58ed6b21cf5, 6abe8fe36b29ff51d1a42c2f338972883f4751a5, 6.1.191, 6.6.160, 6.12.114, 5.16, 6.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ff4273d47da81b95ed9396110bcbd1b7b7470fe8 ≤ v < afe5c022a180e0ade394d3fffbafc1a701f50993, 2fbf6c9695ad9f05e7e5c166bf43fac7cb3276b3 ≤ v < d8ecdceeb90cd2c265b222a7b65487faf68fea73, 969d8beaa2e374387bf9aa5602ef84fc50bb48d8 ≤ v < 916e27f71a80f6d77c48d1a1a5782d6d5ef9017c, 9ca67840c0ddf3f39407339624cef824a4f27599 ≤ v < a60bc2df2d323cc1342f0cf95563cae266801e20, 9ca67840c0ddf3f39407339624cef824a4f27599 ≤ v < c59b3393df1348a12308aaabd5fbc58ed6b21cf5, 9ca67840c0ddf3f39407339624cef824a4f27599 ≤ v < 6abe8fe36b29ff51d1a42c2f338972883f4751a5, 91ff1e9652fb9beb0174267d6bb38243dff211bb, 8a8a3547d5c4960da053df49c75bf623827a25da, 6.1.138 ≤ v < 6.1.191, 6.6.90 ≤ v < 6.6.160, 6.12.28 ≤ v < 6.12.114, 5.15.182 ≤ v < 5.16, 6.14.6 ≤ v < 6.15, 6.15 | afe5c022a180e0ade394d3fffbafc1a701f50993, d8ecdceeb90cd2c265b222a7b65487faf68fea73, 916e27f71a80f6d77c48d1a1a5782d6d5ef9017c, a60bc2df2d323cc1342f0cf95563cae266801e20, c59b3393df1348a12308aaabd5fbc58ed6b21cf5, 6abe8fe36b29ff51d1a42c2f338972883f4751a5, 6.1.191, 6.6.160, 6.12.114, 5.16, 6.15 |
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