CVE-2026-98765 (GCVE-0-2026-98765)
Vulnerability from cvelistv5
Published
2026-10-18 15:47
Modified
2026-10-30 12:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: gadget: dummy-hcd: Fix wait for outstanding request completions The dummy-hcd driver emulates synchronize_irq() by waiting until its private callback_usage counter drops to 0 (with the private lock not held). This counter is incremented whenever a gadget driver callback occurs (which requires the private lock to be dropped), but not when a request completion handler is called. This is an oversight. Request completion is triggered by timer interrupts (emulating device IRQs in a real UDC), and the interrupt handlers are supposed to have completed when the synchronize_irq() emulation routine returns -- they aren't supposed to be in the middle of a completion callback. If this happens it can lead to a gadget driver's unbind routine running before all outstanding request completions have finished, maybe even allowing the gadget driver's module to be unloaded while a completion handler is still running. Fix the oversight by incrementing the callback_usage value across request completion callbacks.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81
Version: 7b416b9dac6ede26d4ca0c1a88b448b543623ff3
Version: 8590bc1da625dd4a589eac0fc3aa3cf4f400424d
Version: a867d5b932ac4911d3f8a1e63505061b0c81f889
Version: e84b4a008365b7edbd842a063ae28d040a98db25
Version: e39b17143a5b5aac81f066d455e5d3a9877eb3ae
Version: 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715
Version: 3.2.97   ≤
Version: 3.16.52   ≤
Version: 4.1.46   ≤
Version: 4.4.92   ≤
Version: 4.9.55   ≤
Version: 4.13.6   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: dummy-hcd: Fix wait for outstanding request completions\n\nThe dummy-hcd driver emulates synchronize_irq() by waiting until its\nprivate callback_usage counter drops to 0 (with the private lock not\nheld).  This counter is incremented whenever a gadget driver callback\noccurs (which requires the private lock to be dropped), but not when a\nrequest completion handler is called.\n\nThis is an oversight.  Request completion is triggered by timer\ninterrupts (emulating device IRQs in a real UDC), and the interrupt\nhandlers are supposed to have completed when the synchronize_irq()\nemulation routine returns -- they aren\u0027t supposed to be in the middle\nof a completion callback.  If this happens it can lead to a gadget\ndriver\u0027s unbind routine running before all outstanding request\ncompletions have finished, maybe even allowing the gadget driver\u0027s\nmodule to be unloaded while a completion handler is still running.\n\nFix the oversight by incrementing the callback_usage value across\nrequest completion callbacks."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:34.382Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/32721319e89a2be610b0518b88f0d188ce878063"
        },
        {
          "url": "https://git.kernel.org/stable/c/48ef54100ceffbd1a055f193873574c45f408eb5"
        },
        {
          "url": "https://git.kernel.org/stable/c/d77cc7c0d739fb17413714c5c4914bd396502e20"
        },
        {
          "url": "https://git.kernel.org/stable/c/6849e51b89de5b6fc7447dc8e612b58df19c7dea"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2"
        },
        {
          "url": "https://git.kernel.org/stable/c/5298c96bf0068f3160969f7ddad81976d01a9b66"
        },
        {
          "url": "https://git.kernel.org/stable/c/3070806a7bc7bb36ed04a21022c09dafcc5619f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b263ff9b0fc5c1f371d65c4eb196b31263d039ff"
        }
      ],
      "title": "USB: gadget: dummy-hcd: Fix wait for outstanding request completions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98765",
    "datePublished": "2026-10-18T15:47:57.358Z",
    "dateReserved": "2026-09-25T10:25:14.368Z",
    "dateUpdated": "2026-10-30T12:39:34.382Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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