CVE-2026-93084 (GCVE-0-2026-93084)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-19 09:05
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Drop handle on protocol bind failures The SCMI bus notifier acquires an SCMI handle when the driver core emits BUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe callback. The protocol probe path only checks whether sdev->handle is set. If device_link_add() fails after the handle has been acquired, the protocol device can still bind with a valid handle but without the dependency link to the SCMI parent. A concurrent parent unbind can then miss the child and tear down the SCMI instance while the child still holds a handle into it. If the protocol driver probe later fails, for example with -EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather than BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the handle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind leaked the SCMI instance users refcount and left sdev->handle set after the failed probe. Make the link helper report failure and drop the acquired handle if the link cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the same cleanup path used for unbind so failed probes balance the earlier BUS_NOTIFY_BIND_DRIVER acquisition.
References
Impacted products
Vendor Product Version
Linux Linux Version: 971fc0665f1361f23251e4d85fac4aed1b683505
Version: 971fc0665f1361f23251e4d85fac4aed1b683505
Version: 971fc0665f1361f23251e4d85fac4aed1b683505
Version: 971fc0665f1361f23251e4d85fac4aed1b683505
Version: 971fc0665f1361f23251e4d85fac4aed1b683505
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "6.12.110",
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Drop handle on protocol bind failures\n\nThe SCMI bus notifier acquires an SCMI handle when the driver core emits\nBUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe\ncallback. The protocol probe path only checks whether sdev-\u003ehandle is\nset.\n\nIf device_link_add() fails after the handle has been acquired, the\nprotocol device can still bind with a valid handle but without the\ndependency link to the SCMI parent. A concurrent parent unbind can then\nmiss the child and tear down the SCMI instance while the child still\nholds a handle into it.\n\nIf the protocol driver probe later fails, for example with\n-EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather\nthan BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the\nhandle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind\nleaked the SCMI instance users refcount and left sdev-\u003ehandle set after\nthe failed probe.\n\nMake the link helper report failure and drop the acquired handle if the\nlink cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the\nsame cleanup path used for unbind so failed probes balance the earlier\nBUS_NOTIFY_BIND_DRIVER acquisition."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:05:19.893Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f860db24ee95e5da4866303a35e55098b9641b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/df273eced7cec550465fd1bb82a5d2c3c7d3c437"
        },
        {
          "url": "https://git.kernel.org/stable/c/a54dc23e8bd2246c28eafffa60b4634f0d1a11cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/77d2985d1e80e67f32026fc03e975c4c83cc543d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3a5c30d233ca5d3e799a80da806554c703bda13"
        }
      ],
      "title": "firmware: arm_scmi: Drop handle on protocol bind failures",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93084",
    "datePublished": "2026-09-17T16:11:03.659Z",
    "dateReserved": "2026-09-17T15:57:05.662Z",
    "dateUpdated": "2026-10-19T09:05:19.893Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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