CVE-2026-98767
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.
How to fix
- Linux Linux2c41e442ff6304532bf369aa618b23c8a474feb4, 86b9c867fb061a147df05ff0d9bb69dd3d79f49a, 6cd82563bb270e03fe2f91324660ea14e3ce5d1a, 96918ca25ff467c25675478fc79393df4ae9d74c, ba927133b301894e7d24099afbb701887c8cd2f1, f51cadb02b439850ab411df0a2cf4288a66d42e2, 1ff77cbefe5a653ea12874c213ea4bd0d72c1067, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 5.5, 5.11, 6.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | c0079630f268843a25ed75226169cba40e0d8880 ≤ v < 2c41e442ff6304532bf369aa618b23c8a474feb4, a44547015287a19001384fe94dbff84c92ce4ee1 ≤ v < 86b9c867fb061a147df05ff0d9bb69dd3d79f49a, c4d80e41cb42008dceb35e5dbf52574d93beac0d ≤ v < 6cd82563bb270e03fe2f91324660ea14e3ce5d1a, 52a7c9d930b95aa8b1620edaba4818040c32631f ≤ v < 96918ca25ff467c25675478fc79393df4ae9d74c, 63ccd26cd1f6600421795f6ca3e625076be06c9f ≤ v < ba927133b301894e7d24099afbb701887c8cd2f1, 63ccd26cd1f6600421795f6ca3e625076be06c9f ≤ v < f51cadb02b439850ab411df0a2cf4288a66d42e2, 63ccd26cd1f6600421795f6ca3e625076be06c9f ≤ v < 1ff77cbefe5a653ea12874c213ea4bd0d72c1067, 015c39f38e69a491d2abd5e98869a500a9459b3b, b43225948b231b3f331194010f84512bee4d9f59, 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d, 5.15.181 ≤ v < 5.15.224, 6.1.136 ≤ v < 6.1.191, 6.6.89 ≤ v < 6.6.160, 6.12.26 ≤ v < 6.12.113, 5.4.293 ≤ v < 5.5, 5.10.237 ≤ v < 5.11, 6.14.5 ≤ v < 6.15, 6.15 | 2c41e442ff6304532bf369aa618b23c8a474feb4, 86b9c867fb061a147df05ff0d9bb69dd3d79f49a, 6cd82563bb270e03fe2f91324660ea14e3ce5d1a, 96918ca25ff467c25675478fc79393df4ae9d74c, ba927133b301894e7d24099afbb701887c8cd2f1, f51cadb02b439850ab411df0a2cf4288a66d42e2, 1ff77cbefe5a653ea12874c213ea4bd0d72c1067, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 5.5, 5.11, 6.15 |
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