CVE-2026-98767None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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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.
Linux >= 52a7c9d930b95aa8b1620edaba4818040c32631f < 96918ca25ff467c25675478fc79393df4ae9d74cLinux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < ba927133b301894e7d24099afbb701887c8cd2f1Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < f51cadb02b439850ab411df0a2cf4288a66d42e2Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < 1ff77cbefe5a653ea12874c213ea4bd0d72c1067Linux 015c39f38e69a491d2abd5e98869a500a9459b3bLinux b43225948b231b3f331194010f84512bee4d9f59Linux c0079630f268843a25ed75226169cba40e0d8880Linux a44547015287a19001384fe94dbff84c92ce4ee1Linux c4d80e41cb42008dceb35e5dbf52574d93beac0dLinux 99d655119b870ee60e4dbf310aa9a1ed8d9ede3dLinux >= 6.12.26 < 6.12.113Linux >= 5.4.293 < 5.5Linux >= 5.10.237 < 5.11Linux >= 5.15.181 < 5.16Linux >= 6.1.136 < 6.2Linux >= 6.6.89 < 6.7Linux >= 6.14.5 < 6.15Linux 6.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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