---
id: CVE-2026-98767
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 63ccd26cd…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 52a7c9d930b95aa8b1620edaba4818040c32631f <
    96918ca25ff467c25675478fc79393df4ae9d74c
  - >-
    Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f <
    ba927133b301894e7d24099afbb701887c8cd2f1
  - >-
    Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f <
    f51cadb02b439850ab411df0a2cf4288a66d42e2
  - >-
    Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f <
    1ff77cbefe5a653ea12874c213ea4bd0d72c1067
  - Linux 015c39f38e69a491d2abd5e98869a500a9459b3b
  - Linux b43225948b231b3f331194010f84512bee4d9f59
  - Linux c0079630f268843a25ed75226169cba40e0d8880
  - Linux a44547015287a19001384fe94dbff84c92ce4ee1
  - Linux c4d80e41cb42008dceb35e5dbf52574d93beac0d
  - Linux 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d
  - Linux >= 6.12.26 < 6.12.113
  - Linux >= 5.4.293 < 5.5
  - Linux >= 5.10.237 < 5.11
  - Linux >= 5.15.181 < 5.16
  - Linux >= 6.1.136 < 6.2
  - Linux >= 6.6.89 < 6.7
  - Linux >= 6.14.5 < 6.15
  - Linux 6.15
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:48:02.089Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98767'
references:
  - 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'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.494Z'
---

## Overview

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.

## Affected

- `Linux >= 52a7c9d930b95aa8b1620edaba4818040c32631f < 96918ca25ff467c25675478fc79393df4ae9d74c`
- `Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < ba927133b301894e7d24099afbb701887c8cd2f1`
- `Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < f51cadb02b439850ab411df0a2cf4288a66d42e2`
- `Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < 1ff77cbefe5a653ea12874c213ea4bd0d72c1067`
- `Linux 015c39f38e69a491d2abd5e98869a500a9459b3b`
- `Linux b43225948b231b3f331194010f84512bee4d9f59`
- `Linux c0079630f268843a25ed75226169cba40e0d8880`
- `Linux a44547015287a19001384fe94dbff84c92ce4ee1`
- `Linux c4d80e41cb42008dceb35e5dbf52574d93beac0d`
- `Linux 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d`
- `Linux >= 6.12.26 < 6.12.113`
- `Linux >= 5.4.293 < 5.5`
- `Linux >= 5.10.237 < 5.11`
- `Linux >= 5.15.181 < 5.16`
- `Linux >= 6.1.136 < 6.2`
- `Linux >= 6.6.89 < 6.7`
- `Linux >= 6.14.5 < 6.15`
- `Linux 6.15`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.