CVE-2026-98765
In the Linux kernel, the following vulnerability has been resolved:
USB: gadget: dummy-hcd: Fix wait for outstanding request completions
The dummy-hcd driver emulates synchronize_irq() by waiting until its private callback_usage counter drops to 0 (with the private lock not held). This counter is incremented whenever a gadget driver callback occurs (which requires the private lock to be dropped), but not when a request completion handler is called.
This is an oversight. Request completion is triggered by timer interrupts (emulating device IRQs in a real UDC), and the interrupt handlers are supposed to have completed when the synchronize_irq() emulation routine returns -- they aren't supposed to be in the middle of a completion callback. If this happens it can lead to a gadget driver's unbind routine running before all outstanding request completions have finished, maybe even allowing the gadget driver's module to be unloaded while a completion handler is still running.
Read full descriptionShow less
Fix the oversight by incrementing the callback_usage value across request completion callbacks.
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.17 %
- Percentile among all scored CVEs
- 6
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
Show 4 references
Raw JSON (NVD)
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{
"id": "CVE-2026-98765",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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{
"status": "affected",
"version": "7dbd8f4cabd96db5a50513de9d83a8105a5ffc81",
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{
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{
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{
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{
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{
"status": "affected",
"version": "4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715",
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{
"status": "affected",
"version": "3.2.97",
"lessThan": "3.3",
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{
"status": "affected",
"version": "3.16.52",
"lessThan": "3.17",
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{
"status": "affected",
"version": "4.1.46",
"lessThan": "4.2",
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{
"status": "affected",
"version": "4.4.92",
"lessThan": "4.5",
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},
{
"status": "affected",
"version": "4.9.55",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.13.6",
"lessThan": "4.14",
"versionType": "semver"
}
],
"programFiles": [
"drivers/usb/gadget/udc/dummy_hcd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.14"
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{
"status": "unaffected",
"version": "0",
"lessThan": "4.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/gadget/udc/dummy_hcd.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:30.323",
"references": [
{
"url": "https://git.kernel.org/stable/c/3070806a7bc7bb36ed04a21022c09dafcc5619f4",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5298c96bf0068f3160969f7ddad81976d01a9b66",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b263ff9b0fc5c1f371d65c4eb196b31263d039ff",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: dummy-hcd: Fix wait for outstanding request completions\n\nThe dummy-hcd driver emulates synchronize_irq() by waiting until its\nprivate callback_usage counter drops to 0 (with the private lock not\nheld). This counter is incremented whenever a gadget driver callback\noccurs (which requires the private lock to be dropped), but not when a\nrequest completion handler is called.\n\nThis is an oversight. Request completion is triggered by timer\ninterrupts (emulating device IRQs in a real UDC), and the interrupt\nhandlers are supposed to have completed when the synchronize_irq()\nemulation routine returns -- they aren't supposed to be in the middle\nof a completion callback. If this happens it can lead to a gadget\ndriver's unbind routine running before all outstanding request\ncompletions have finished, maybe even allowing the gadget driver's\nmodule to be unloaded while a completion handler is still running.\n\nFix the oversight by incrementing the callback_usage value across\nrequest completion callbacks."
}
],
"lastModified": "2026-10-19T10:19:40.617",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}