CVE-2026-98767 (GCVE-0-2026-98767)
Vulnerability from cvelistv5
Published
2026-10-18 15:48
Modified
2026-10-30 12:39
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: c0079630f268843a25ed75226169cba40e0d8880
Version: a44547015287a19001384fe94dbff84c92ce4ee1
Version: c4d80e41cb42008dceb35e5dbf52574d93beac0d
Version: 52a7c9d930b95aa8b1620edaba4818040c32631f
Version: 63ccd26cd1f6600421795f6ca3e625076be06c9f
Version: 63ccd26cd1f6600421795f6ca3e625076be06c9f
Version: 63ccd26cd1f6600421795f6ca3e625076be06c9f
Version: 015c39f38e69a491d2abd5e98869a500a9459b3b
Version: b43225948b231b3f331194010f84512bee4d9f59
Version: 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d
Version: 5.15.181   ≤
Version: 6.1.136   ≤
Version: 6.6.89   ≤
Version: 6.12.26   ≤
Version: 5.4.293   ≤
Version: 5.10.237   ≤
Version: 6.14.5   ≤
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{
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:36.527Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2c41e442ff6304532bf369aa618b23c8a474feb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/86b9c867fb061a147df05ff0d9bb69dd3d79f49a"
        },
        {
          "url": "https://git.kernel.org/stable/c/6cd82563bb270e03fe2f91324660ea14e3ce5d1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067"
        }
      ],
      "title": "usb: dwc3: gadget: fix IRQ storm on invalid event buffer count",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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