CVE-2026-98767usb: dwc3: gadget: fix IRQ storm on invalid event buffer count
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 52a7c9d930b95aa8b1620edaba4818040c32631f before 96918ca25ff467c25675478fc79393df4ae9d74c; from 63ccd26cd1f6600421795f6ca3e625076be06c9f before ba927133b301894e7d24099afbb701887c8cd2f1; from 63ccd26cd1f6600421795f6ca3e625076be06c9f before f51cadb02b439850ab411df0a2cf4288a66d42e2; 63ccd26cd1f6600421795f6ca3e625076be06c9f builds before 1ff77cbefe5a653ea12874c213ea4bd0d72c1067; 015c39f38e69a491d2abd5e98869a500a9459b3b; b43225948b231b3f331194010f84512bee4d9f59; c0079630f268843a25ed75226169cba40e0d8880; a44547015287a19001384fe94dbff84c92ce4ee1; and 9 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c
- https://git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1
- https://git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2
- https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.