Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c4d80e41cb42008dceb35e5dbf52574d93beac0d before 6cd82563bb270e03fe2f91324660ea14e3ce5d1a; affected 52a7c9d930b95aa8b1620edaba4818040c32631f before 96918ca25ff467c25675478fc79393df4ae9d74c; affected 63ccd26cd1f6600421795f6ca3e625076be06c9f before ba927133b301894e7d24099afbb701887c8cd2f1; affected 63ccd26cd1f6600421795f6ca3e625076be06c9f before f51cadb02b439850ab411df0a2cf4288a66d42e2; affected 63ccd26cd1f6600421795f6ca3e625076be06c9f before 1ff77cbefe5a653ea12874c213ea4bd0d72c1067; affected 015c39f38e69a491d2abd5e98869a500a9459b3b; affected b43225948b231b3f331194010f84512bee4d9f59; affected c0079630f268843a25ed75226169cba40e0d8880; affected a44547015287a19001384fe94dbff84c92ce4ee1; affected 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d; affected 6.6.89 before 6.6.160; affected 6.12.26 before 6.12.113; affected 5.4.293 before 5.5; affected 5.10.237 before 5.11; affected 5.15.181 before 5.16; affected 6.1.136 before 6.2; affected 6.14.5 before 6.15 |
| Linux / Linux | affected 6.15; unaffected 0 before 6.15; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6cd82563bb270e03fe2f91324660ea14e3ce5d1a
- 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