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CVE-2026-93081 (GCVE-0-2026-93081)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-17 16:11
VLAI
Title
firmware: arm_scmi: Fix SCMI device destroy lifetimes
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9ca67840c0ddf3f39407339624cef824a4f27599 , < c59b3393df1348a12308aaabd5fbc58ed6b21cf5 (git)
Affected: 9ca67840c0ddf3f39407339624cef824a4f27599 , < 6abe8fe36b29ff51d1a42c2f338972883f4751a5 (git)
Affected: 91ff1e9652fb9beb0174267d6bb38243dff211bb (git)
Affected: ff4273d47da81b95ed9396110bcbd1b7b7470fe8 (git)
Affected: 2fbf6c9695ad9f05e7e5c166bf43fac7cb3276b3 (git)
Affected: 969d8beaa2e374387bf9aa5602ef84fc50bb48d8 (git)
Affected: 8a8a3547d5c4960da053df49c75bf623827a25da (git)
Affected: 5.15.182 , < 5.16 (semver)
Affected: 6.1.138 , < 6.2 (semver)
Affected: 6.6.90 , < 6.7 (semver)
Affected: 6.12.28 , < 6.13 (semver)
Affected: 6.14.6 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
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          "product": "Linux",
          "programFiles": [
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          "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": "2026-09-17T16:11:01.679Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-09-17T16:11:01.679Z",
    "dateReserved": "2026-09-17T15:57:05.662Z",
    "dateUpdated": "2026-09-17T16:11:01.679Z",
    "state": "PUBLISHED"
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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."
          }
        ],
        "id": "CVE-2026-93081",
        "lastModified": "2026-09-17T17:18:02.063",
        "metrics": {},
        "published": "2026-09-17T17:18:02.063",
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        "vulnStatus": "Received"
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    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-18T00:12:29Z",
      "cve": "CVE-2026-93081",
      "id": "CVE-2026-93081",
      "initial_release_date": "2026-09-18T00:12:29Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93081",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93081.json",
      "version": "2"
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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