CVE-2026-98767 (GCVE-0-2026-98767)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:48 – Updated: 2026-10-30 12:39
VLAI
Title
usb: dwc3: gadget: fix IRQ storm on invalid event buffer count
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: gadget: fix IRQ storm on invalid event buffer count When dwc3_check_event_buf() reads a GEVNTCOUNT value exceeding the event buffer length, commit 63ccd26cd1f6 ("usb: dwc3: gadget: check that event count does not exceed event buffer length") returns IRQ_NONE without writing back GEVNTCOUNT. Since the DWC3 interrupt is level-triggered, the uncleared IRQ source keeps the line asserted, causing a tight IRQ storm that accumulates 99,900 unhandled interrupts and triggers spurious.c:184 BUG -> kernel panic. The resulting call stack: __report_bad_irq+0xac/0xc8 note_interrupt+0x340/0x468 handle_irq_event+0xac/0xc0 handle_fasteoi_irq+0x120/0x228 gic_handle_irq+0x68/0x108 ... kernel BUG at kernel/irq/spurious.c:184 To reproduce, write a bogus value exceeding the event buffer length directly to the GEVNTCOUNT register: devmem <DWC3_BASE + 0xc40c> 4 0x1004 Write the bogus count back to GEVNTCOUNT to clear the IRQ source, consistent with the stale event clearing pattern in dwc3_event_buffers_setup(), and schedule error recovery to reinitialize the controller.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c0079630f268843a25ed75226169cba40e0d8880 , < 2c41e442ff6304532bf369aa618b23c8a474feb4 (git)
Affected: a44547015287a19001384fe94dbff84c92ce4ee1 , < 86b9c867fb061a147df05ff0d9bb69dd3d79f49a (git)
Affected: c4d80e41cb42008dceb35e5dbf52574d93beac0d , < 6cd82563bb270e03fe2f91324660ea14e3ce5d1a (git)
Affected: 52a7c9d930b95aa8b1620edaba4818040c32631f , < 96918ca25ff467c25675478fc79393df4ae9d74c (git)
Affected: 63ccd26cd1f6600421795f6ca3e625076be06c9f , < ba927133b301894e7d24099afbb701887c8cd2f1 (git)
Affected: 63ccd26cd1f6600421795f6ca3e625076be06c9f , < f51cadb02b439850ab411df0a2cf4288a66d42e2 (git)
Affected: 63ccd26cd1f6600421795f6ca3e625076be06c9f , < 1ff77cbefe5a653ea12874c213ea4bd0d72c1067 (git)
Affected: 015c39f38e69a491d2abd5e98869a500a9459b3b (git)
Affected: b43225948b231b3f331194010f84512bee4d9f59 (git)
Affected: 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d (git)
Affected: 5.15.181 , < 5.15.224 (semver)
Affected: 6.1.136 , < 6.1.191 (semver)
Affected: 6.6.89 , < 6.6.160 (semver)
Affected: 6.12.26 , < 6.12.113 (semver)
Affected: 5.4.293 , < 5.5 (semver)
Affected: 5.10.237 , < 5.11 (semver)
Affected: 6.14.5 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (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)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: fix IRQ storm on invalid event buffer count\n\nWhen dwc3_check_event_buf() reads a GEVNTCOUNT value exceeding the\nevent buffer length, commit 63ccd26cd1f6 (\"usb: dwc3: gadget: check\nthat event count does not exceed event buffer length\") returns IRQ_NONE\nwithout writing back GEVNTCOUNT. Since the DWC3 interrupt is\nlevel-triggered, the uncleared IRQ source keeps the line asserted,\ncausing a tight IRQ storm that accumulates 99,900 unhandled interrupts\nand triggers spurious.c:184 BUG -\u003e kernel panic.\n\nThe resulting call stack:\n  __report_bad_irq+0xac/0xc8\n  note_interrupt+0x340/0x468\n  handle_irq_event+0xac/0xc0\n  handle_fasteoi_irq+0x120/0x228\n  gic_handle_irq+0x68/0x108\n  ...\n  kernel BUG at kernel/irq/spurious.c:184\n\nTo reproduce, write a bogus value exceeding the event buffer length\ndirectly to the GEVNTCOUNT register:\n\n  devmem \u003cDWC3_BASE + 0xc40c\u003e 4 0x1004\n\nWrite the bogus count back to GEVNTCOUNT to clear the IRQ source,\nconsistent with the stale event clearing pattern in\ndwc3_event_buffers_setup(), and schedule error recovery to\nreinitialize the controller."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:36.527Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2c41e442ff6304532bf369aa618b23c8a474feb4"
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        {
          "url": "https://git.kernel.org/stable/c/86b9c867fb061a147df05ff0d9bb69dd3d79f49a"
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          "url": "https://git.kernel.org/stable/c/6cd82563bb270e03fe2f91324660ea14e3ce5d1a"
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        },
        {
          "url": "https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067"
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      "title": "usb: dwc3: gadget: fix IRQ storm on invalid event buffer count",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98767",
    "datePublished": "2026-10-18T15:48:02.089Z",
    "dateReserved": "2026-09-25T10:25:14.369Z",
    "dateUpdated": "2026-10-30T12:39:36.527Z",
    "state": "PUBLISHED"
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      "date": "2026-11-08",
      "epss": "0.00172",
      "percentile": "0.06666"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-98767",
      "id": "msrc_CVE-2026-98767",
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      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: dwc3: gadget: fix IRQ storm on invalid event buffer count",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98767.json",
      "version": "4"
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      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
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          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: fix IRQ storm on invalid event buffer count\n\nWhen dwc3_check_event_buf() reads a GEVNTCOUNT value exceeding the\nevent buffer length, commit 63ccd26cd1f6 (\"usb: dwc3: gadget: check\nthat event count does not exceed event buffer length\") returns IRQ_NONE\nwithout writing back GEVNTCOUNT. Since the DWC3 interrupt is\nlevel-triggered, the uncleared IRQ source keeps the line asserted,\ncausing a tight IRQ storm that accumulates 99,900 unhandled interrupts\nand triggers spurious.c:184 BUG -\u003e kernel panic.\n\nThe resulting call stack:\n  __report_bad_irq+0xac/0xc8\n  note_interrupt+0x340/0x468\n  handle_irq_event+0xac/0xc0\n  handle_fasteoi_irq+0x120/0x228\n  gic_handle_irq+0x68/0x108\n  ...\n  kernel BUG at kernel/irq/spurious.c:184\n\nTo reproduce, write a bogus value exceeding the event buffer length\ndirectly to the GEVNTCOUNT register:\n\n  devmem \u003cDWC3_BASE + 0xc40c\u003e 4 0x1004\n\nWrite the bogus count back to GEVNTCOUNT to clear the IRQ source,\nconsistent with the stale event clearing pattern in\ndwc3_event_buffers_setup(), and schedule error recovery to\nreinitialize the controller."
          }
        ],
        "id": "CVE-2026-98767",
        "lastModified": "2026-10-30T13:21:26.350",
        "metrics": {},
        "published": "2026-10-18T16:17:30.550",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2c41e442ff6304532bf369aa618b23c8a474feb4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6cd82563bb270e03fe2f91324660ea14e3ce5d1a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/86b9c867fb061a147df05ff0d9bb69dd3d79f49a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:11:34+00:00",
      "cve": "CVE-2026-98767",
      "id": "CVE-2026-98767",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: dwc3: gadget: fix IRQ storm on invalid event buffer count",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98767.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T23:47:11Z",
      "cve": "CVE-2026-98767",
      "id": "CVE-2026-98767",
      "initial_release_date": "2026-10-20T23:47:11Z",
      "product_status:known_affected": "62",
      "product_status:known_not_affected": "286",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98767",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98767.json",
      "version": "2"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.