usb: dwc3: gadget: fix IRQ storm on invalid event buffer count
Summary
| CVE | CVE-2026-98767 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-10-18 16:17:30 UTC |
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| Updated | 2026-10-18 16:17:30 UTC |
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| 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 52a7c9d930b95aa8b1620edaba4818040c32631f 96918ca25ff467c25675478fc79393df4ae9d74c git |
Not specified |
| CNA |
Linux |
Linux |
affected 63ccd26cd1f6600421795f6ca3e625076be06c9f ba927133b301894e7d24099afbb701887c8cd2f1 git |
Not specified |
| CNA |
Linux |
Linux |
affected 63ccd26cd1f6600421795f6ca3e625076be06c9f f51cadb02b439850ab411df0a2cf4288a66d42e2 git |
Not specified |
| CNA |
Linux |
Linux |
affected 63ccd26cd1f6600421795f6ca3e625076be06c9f 1ff77cbefe5a653ea12874c213ea4bd0d72c1067 git |
Not specified |
| CNA |
Linux |
Linux |
affected 015c39f38e69a491d2abd5e98869a500a9459b3b git |
Not specified |
| CNA |
Linux |
Linux |
affected b43225948b231b3f331194010f84512bee4d9f59 git |
Not specified |
| CNA |
Linux |
Linux |
affected c0079630f268843a25ed75226169cba40e0d8880 git |
Not specified |
| CNA |
Linux |
Linux |
affected a44547015287a19001384fe94dbff84c92ce4ee1 git |
Not specified |
| CNA |
Linux |
Linux |
affected c4d80e41cb42008dceb35e5dbf52574d93beac0d git |
Not specified |
| CNA |
Linux |
Linux |
affected 99d655119b870ee60e4dbf310aa9a1ed8d9ede3d git |
Not specified |
| CNA |
Linux |
Linux |
affected 6.12.26 6.12.113 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.4.293 5.5 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.10.237 5.11 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.15.181 5.16 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.1.136 6.2 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6.89 6.7 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.14.5 6.15 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.15 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.15 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.113 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.56 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.10 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc6 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/ba927133b301894e7d24099afbb701887c8cd2f1 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/96918ca25ff467c25675478fc79393df4ae9d74c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/f51cadb02b439850ab411df0a2cf4288a66d42e2 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/1ff77cbefe5a653ea12874c213ea4bd0d72c1067 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.