CVE-2026-92506 (GCVE-0-2026-92506)
Vulnerability from cvelistv5
Published
2026-09-17 16:10
Modified
2026-10-30 12:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Fix requested device removal race scmi_protocol_device_unrequest() drops scmi_requested_devices_mtx while notifying listeners but continues to retain the per-protocol list head. When two SCMI drivers for the same protocol unregister concurrently, one thread can remove the final request and free the list head while the other is running its notifier. The latter then dereferences the freed list head after reacquiring the mutex and can free it a second time. Complete the list and IDR updates, including freeing an empty list head, before dropping the mutex. Keep the blocking notifier outside the critical section and retain only the detached request across the callback.
References
Impacted products
Vendor Product Version
Linux Linux Version: a6fe96b2e371d5fd300cca24459cdcf471c2c741
Version: d3cd7c525fd2ecce3a6c963f314969a54783d211
Version: d3cd7c525fd2ecce3a6c963f314969a54783d211
Version: d3cd7c525fd2ecce3a6c963f314969a54783d211
Version: d3cd7c525fd2ecce3a6c963f314969a54783d211
Version: d3cd7c525fd2ecce3a6c963f314969a54783d211
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{
  "containers": {
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          "programFiles": [
            "drivers/firmware/arm_scmi/bus.c"
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          ],
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Fix requested device removal race\n\nscmi_protocol_device_unrequest() drops scmi_requested_devices_mtx while\nnotifying listeners but continues to retain the per-protocol list head.\nWhen two SCMI drivers for the same protocol unregister concurrently, one\nthread can remove the final request and free the list head while the other\nis running its notifier. The latter then dereferences the freed list head\nafter reacquiring the mutex and can free it a second time.\n\nComplete the list and IDR updates, including freeing an empty list head,\nbefore dropping the mutex. Keep the blocking notifier outside the critical\nsection and retain only the detached request across the callback."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:35:44.199Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/803e50af43ab1c3f76cbc744e496532ec151f305"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ff7713b7308cd6bea3328f7cd750b5eaab42af3"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c35915eaaa81a12340c838c5c2ccb02be2194c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3d4ef1c0ca6917aad6f1093b49f3932944a8c19"
        },
        {
          "url": "https://git.kernel.org/stable/c/21d35c5f46e99e9047bb9ded3ecb5ab440dd75b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c4097e6c4aed276c5e9ec2ab331ab397ea780bf"
        }
      ],
      "title": "firmware: arm_scmi: Fix requested device removal race",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-92506",
    "datePublished": "2026-09-17T16:10:18.067Z",
    "dateReserved": "2026-09-16T12:21:13.872Z",
    "dateUpdated": "2026-10-30T12:35:44.199Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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