CVE-2026-98765 (GCVE-0-2026-98765)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-30 12:39
VLAI
Title
USB: gadget: dummy-hcd: Fix wait for outstanding request completions
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 32721319e89a2be610b0518b88f0d188ce878063 (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 48ef54100ceffbd1a055f193873574c45f408eb5 (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < d77cc7c0d739fb17413714c5c4914bd396502e20 (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 6849e51b89de5b6fc7447dc8e612b58df19c7dea (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2 (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 5298c96bf0068f3160969f7ddad81976d01a9b66 (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < 3070806a7bc7bb36ed04a21022c09dafcc5619f4 (git)
Affected: 7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 , < b263ff9b0fc5c1f371d65c4eb196b31263d039ff (git)
Affected: 7b416b9dac6ede26d4ca0c1a88b448b543623ff3 (git)
Affected: 8590bc1da625dd4a589eac0fc3aa3cf4f400424d (git)
Affected: a867d5b932ac4911d3f8a1e63505061b0c81f889 (git)
Affected: e84b4a008365b7edbd842a063ae28d040a98db25 (git)
Affected: e39b17143a5b5aac81f066d455e5d3a9877eb3ae (git)
Affected: 4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715 (git)
Affected: 3.2.97 , < 3.3 (semver)
Affected: 3.16.52 , < 3.17 (semver)
Affected: 4.1.46 , < 4.2 (semver)
Affected: 4.4.92 , < 4.5 (semver)
Affected: 4.9.55 , < 4.10 (semver)
Affected: 4.13.6 , < 4.14 (semver)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
        }
      ],
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/48ef54100ceffbd1a055f193873574c45f408eb5"
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          "url": "https://git.kernel.org/stable/c/d77cc7c0d739fb17413714c5c4914bd396502e20"
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          "url": "https://git.kernel.org/stable/c/6849e51b89de5b6fc7447dc8e612b58df19c7dea"
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        {
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      "title": "USB: gadget: dummy-hcd: Fix wait for outstanding request completions",
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    "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"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98765",
      "date": "2026-11-01",
      "epss": "0.00176",
      "percentile": "0.07158"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-28T01:47:50.000Z",
      "cve": "CVE-2026-98765",
      "id": "msrc_CVE-2026-98765",
      "initial_release_date": "2026-10-20T01:01:57.000Z",
      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "USB: gadget: dummy-hcd: Fix wait for outstanding request completions",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98765.json",
      "version": "4"
    },
    "nvd": {
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                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.56",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-98765",
        "lastModified": "2026-10-30T13:21:26.047",
        "metrics": {},
        "published": "2026-10-18T16:17:30.323",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3070806a7bc7bb36ed04a21022c09dafcc5619f4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/32721319e89a2be610b0518b88f0d188ce878063"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/48ef54100ceffbd1a055f193873574c45f408eb5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5298c96bf0068f3160969f7ddad81976d01a9b66"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6849e51b89de5b6fc7447dc8e612b58df19c7dea"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b263ff9b0fc5c1f371d65c4eb196b31263d039ff"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d77cc7c0d739fb17413714c5c4914bd396502e20"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-23T05:43:35+00:00",
      "cve": "CVE-2026-98765",
      "id": "CVE-2026-98765",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: USB: gadget: dummy-hcd: Fix wait for outstanding request completions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98765.json",
      "version": "3"
    }
  }
}



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