{"id":"CVE-2026-98767","title":"usb: dwc3: gadget: fix IRQ storm on invalid event buffer count","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: fix IRQ storm on invalid event buffer count\n\nWhen dwc3_check_event_buf() reads a GEVNTCOUNT value exceeding the\nevent buffer length, commit 63ccd26cd…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 52a7c9d930b95aa8b1620edaba4818040c32631f < 96918ca25ff467c25675478fc79393df4ae9d74c","Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < ba927133b301894e7d24099afbb701887c8cd2f1","Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < f51cadb02b439850ab411df0a2cf4288a66d42e2","Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < 1ff77cbefe5a653ea12874c213ea4bd0d72c1067","Linux 015c39f38e69a491d2abd5e98869a500a9459b3b","Linux b43225948b231b3f331194010f84512bee4d9f59","Linux c0079630f268843a25ed75226169cba40e0d8880","Linux a44547015287a19001384fe94dbff84c92ce4ee1","Linux c4d80e41cb42008dceb35e5dbf52574d93beac0d","Linux 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d","Linux >= 6.12.26 < 6.12.113","Linux >= 5.4.293 < 5.5","Linux >= 5.10.237 < 5.11","Linux >= 5.15.181 < 5.16","Linux >= 6.1.136 < 6.2","Linux >= 6.6.89 < 6.7","Linux >= 6.14.5 < 6.15","Linux 6.15"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T09:25:20.488Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98767","references":[{"url":"https://git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c"},{"url":"https://git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1"},{"url":"https://git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2"},{"url":"https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.494Z","slug":"CVE-2026-98767","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: fix IRQ storm on invalid event buffer count\n\nWhen dwc3_check_event_buf() reads a GEVNTCOUNT value exceeding the\nevent buffer length, commit 63ccd26cd1f6 (\"usb: dwc3: gadget: check\nthat event count does not exceed event buffer length\") returns IRQ_NONE\nwithout writing back GEVNTCOUNT. Since the DWC3 interrupt is\nlevel-triggered, the uncleared IRQ source keeps the line asserted,\ncausing a tight IRQ storm that accumulates 99,900 unhandled interrupts\nand triggers spurious.c:184 BUG -> kernel panic.\n\nThe resulting call stack:\n  __report_bad_irq+0xac/0xc8\n  note_interrupt+0x340/0x468\n  handle_irq_event+0xac/0xc0\n  handle_fasteoi_irq+0x120/0x228\n  gic_handle_irq+0x68/0x108\n  ...\n  kernel BUG at kernel/irq/spurious.c:184\n\nTo reproduce, write a bogus value exceeding the event buffer length\ndirectly to the GEVNTCOUNT register:\n\n  devmem <DWC3_BASE + 0xc40c> 4 0x1004\n\nWrite the bogus count back to GEVNTCOUNT to clear the IRQ source,\nconsistent with the stale event clearing pattern in\ndwc3_event_buffers_setup(), and schedule error recovery to\nreinitialize the controller.\n\n## Affected\n\n- `Linux >= 52a7c9d930b95aa8b1620edaba4818040c32631f < 96918ca25ff467c25675478fc79393df4ae9d74c`\n- `Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < ba927133b301894e7d24099afbb701887c8cd2f1`\n- `Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < f51cadb02b439850ab411df0a2cf4288a66d42e2`\n- `Linux >= 63ccd26cd1f6600421795f6ca3e625076be06c9f < 1ff77cbefe5a653ea12874c213ea4bd0d72c1067`\n- `Linux 015c39f38e69a491d2abd5e98869a500a9459b3b`\n- `Linux b43225948b231b3f331194010f84512bee4d9f59`\n- `Linux c0079630f268843a25ed75226169cba40e0d8880`\n- `Linux a44547015287a19001384fe94dbff84c92ce4ee1`\n- `Linux c4d80e41cb42008dceb35e5dbf52574d93beac0d`\n- `Linux 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d`\n- `Linux >= 6.12.26 < 6.12.113`\n- `Linux >= 5.4.293 < 5.5`\n- `Linux >= 5.10.237 < 5.11`\n- `Linux >= 5.15.181 < 5.16`\n- `Linux >= 6.1.136 < 6.2`\n- `Linux >= 6.6.89 < 6.7`\n- `Linux >= 6.14.5 < 6.15`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}