CVE-2026-93081 (GCVE-0-2026-93081)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-30 12:35
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ff4273d47da81b95ed9396110bcbd1b7b7470fe8
Version: 2fbf6c9695ad9f05e7e5c166bf43fac7cb3276b3
Version: 969d8beaa2e374387bf9aa5602ef84fc50bb48d8
Version: 9ca67840c0ddf3f39407339624cef824a4f27599
Version: 9ca67840c0ddf3f39407339624cef824a4f27599
Version: 9ca67840c0ddf3f39407339624cef824a4f27599
Version: 91ff1e9652fb9beb0174267d6bb38243dff211bb
Version: 8a8a3547d5c4960da053df49c75bf623827a25da
Version: 6.1.138   ≤
Version: 6.6.90   ≤
Version: 6.12.28   ≤
Version: 5.15.182   ≤
Version: 6.14.6   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Fix SCMI device destroy lifetimes\n\nscmi_child_dev_find() drops the reference returned by\ndevice_find_child() before returning the scmi_device pointer. A\nconcurrent unregister can then release the device while the destroy path\nis still using the returned pointer.\n\nMake the lookup helper return the device_find_child() reference and keep\nit until scmi_device_destroy() has finished unregistering the child.\n\nAlso split device_unregister() in __scmi_device_destroy() so the SCMI bus\nID is not made reusable until after device_del() has removed the old\nscmi_dev.N name from sysfs. This avoids a new SCMI device reusing the\nsame ID while the old device is still registered.\n\nThe final device release callback is also a possible cleanup path when\nSCMI children are deleted by driver core recursion rather than\n__scmi_device_destroy(). Release the SCMI bus ID from a common helper\nused by destroy, register-failure and final-release paths, and clear\nscmi_dev-\u003eid after freeing it so the final release cannot free the same\nID again."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:35:49.648Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/afe5c022a180e0ade394d3fffbafc1a701f50993"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8ecdceeb90cd2c265b222a7b65487faf68fea73"
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          "url": "https://git.kernel.org/stable/c/916e27f71a80f6d77c48d1a1a5782d6d5ef9017c"
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          "url": "https://git.kernel.org/stable/c/a60bc2df2d323cc1342f0cf95563cae266801e20"
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        {
          "url": "https://git.kernel.org/stable/c/c59b3393df1348a12308aaabd5fbc58ed6b21cf5"
        },
        {
          "url": "https://git.kernel.org/stable/c/6abe8fe36b29ff51d1a42c2f338972883f4751a5"
        }
      ],
      "title": "firmware: arm_scmi: Fix SCMI device destroy lifetimes",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93081",
    "datePublished": "2026-09-17T16:11:01.679Z",
    "dateReserved": "2026-09-17T15:57:05.662Z",
    "dateUpdated": "2026-10-30T12:35:49.648Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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