usb: dwc3: gadget: fix IRQ storm on invalid event buffer count
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EPSS probability
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Risk score
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Published
11 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
The usb: dwc3: gadget component in the Linux kernel returns IRQ_NONE without writing back GEVNTCOUNT when it reads a value exceeding the event buffer length. The failure to clear the level-triggered interrupt source leads to an IRQ storm and a kernel panic.
This vulnerability can cause the system to experience a kernel panic and subsequent denial of service because the interrupt source remains uncleared when an invalid GEVNTCOUNT value is read.
What should be done?
- Follow vendor advisories to apply available updates
- Integrate patching logic that prevents writing invalid counts to GEVNTCOUNT
- Schedule error recovery to reinitialize the controller
Chain of evidence and sources
dwc3_check_event_buf() işlevi GEVNTCOUNT değerinin olay arabelleği uzunluğunu aştığını okuduğunda IRQ_NONE döndürür ve GEVNTCOUNT değerini geri yazmaz.
DWC3 kesmesi seviye tetiklemelidir ve temizlenmeyen IRQ kaynağı hattı basılı tutarak 99.900 işlenmeyen kesme ile kernel panic tetikler.
Show the technical text from the sources
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.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
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Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98767 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98767 weaknesses.
Official Sources and Advisories
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