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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98767.mbox cve-icon
https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067 cve-icon cve-icon
https://git.kernel.org/stable/c/2c41e442ff6304532bf369aa618b23c8a474feb4 cve-icon cve-icon
https://git.kernel.org/stable/c/6cd82563bb270e03fe2f91324660ea14e3ce5d1a cve-icon cve-icon
https://git.kernel.org/stable/c/86b9c867fb061a147df05ff0d9bb69dd3d79f49a cve-icon cve-icon
https://git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c cve-icon cve-icon
https://git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1 cve-icon cve-icon
https://git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-98767 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-98767 cve-icon
History

Fri, 30 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
References

Fri, 23 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-668

Fri, 23 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-390
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.1, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Wed, 21 Oct 2026 13:15:00 +0000

Type Values Removed Values Added
References

Sun, 18 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-668

Sun, 18 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
Description 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.
Title usb: dwc3: gadget: fix IRQ storm on invalid event buffer count
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-10-18T15:48:02.089Z

Updated: 2026-10-30T12:39:36.527Z

Reserved: 2026-09-25T10:25:14.369Z

Link: CVE-2026-98767

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-18T16:17:30.550

Modified: 2026-10-30T13:21:26.350

Link: CVE-2026-98767

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-18T00:00:00Z

Links: CVE-2026-98767 - Bugzilla