CVE-2026-98767
Full vulnerability record from the local CVENow database.
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-18 16:17:30.550000
Last modified
2026-10-30 13:21:26.350000
View original CVE JSON
{
"id": "CVE-2026-98767",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-18T16:17:30.550",
"lastModified": "2026-10-30T13:21:26.350",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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 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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/usb/dwc3/core.h",
"drivers/usb/dwc3/ep0.c",
"drivers/usb/dwc3/gadget.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "c0079630f268843a25ed75226169cba40e0d8880",
"lessThan": "2c41e442ff6304532bf369aa618b23c8a474feb4",
"versionType": "git",
"status": "affected"
},
{
"version": "a44547015287a19001384fe94dbff84c92ce4ee1",
"lessThan": "86b9c867fb061a147df05ff0d9bb69dd3d79f49a",
"versionType": "git",
"status": "affected"
},
{
"version": "c4d80e41cb42008dceb35e5dbf52574d93beac0d",
"lessThan": "6cd82563bb270e03fe2f91324660ea14e3ce5d1a",
"versionType": "git",
"status": "affected"
},
{
"version": "52a7c9d930b95aa8b1620edaba4818040c32631f",
"lessThan": "96918ca25ff467c25675478fc79393df4ae9d74c",
"versionType": "git",
"status": "affected"
},
{
"version": "63ccd26cd1f6600421795f6ca3e625076be06c9f",
"lessThan": "ba927133b301894e7d24099afbb701887c8cd2f1",
"versionType": "git",
"status": "affected"
},
{
"version": "63ccd26cd1f6600421795f6ca3e625076be06c9f",
"lessThan": "f51cadb02b439850ab411df0a2cf4288a66d42e2",
"versionType": "git",
"status": "affected"
},
{
"version": "63ccd26cd1f6600421795f6ca3e625076be06c9f",
"lessThan": "1ff77cbefe5a653ea12874c213ea4bd0d72c1067",
"versionType": "git",
"status": "affected"
},
{
"version": "015c39f38e69a491d2abd5e98869a500a9459b3b",
"versionType": "git",
"status": "affected"
},
{
"version": "b43225948b231b3f331194010f84512bee4d9f59",
"versionType": "git",
"status": "affected"
},
{
"version": "99d655119b870ee60e4dbf310aa9a1ed8d9ede3d",
"versionType": "git",
"status": "affected"
},
{
"version": "5.15.181",
"lessThan": "5.15.224",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.1.136",
"lessThan": "6.1.191",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.6.89",
"lessThan": "6.6.160",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.12.26",
"lessThan": "6.12.113",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.4.293",
"lessThan": "5.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "5.10.237",
"lessThan": "5.11",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.14.5",
"lessThan": "6.15",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/usb/dwc3/core.h",
"drivers/usb/dwc3/ep0.c",
"drivers/usb/dwc3/gadget.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.15",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.15",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.56",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.10",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2c41e442ff6304532bf369aa618b23c8a474feb4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6cd82563bb270e03fe2f91324660ea14e3ce5d1a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/86b9c867fb061a147df05ff0d9bb69dd3d79f49a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}