FKIE_CVE-2026-80923
Vulnerability from fkie_nvd - Published: 2026-09-09 17:17 - Updated: 2026-09-09 17:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
xhci: dbgtty: Fix unregister on tty_register_driver() failure
If tty_register_driver() fails, it drops the reference, but fails to set
the global dbc_tty_driver to NULL, causing the unregister to be called
again when module exits.
On module unload dbc_tty_exit() only gates its cleanup on the driver
pointer being non-NULL, so it operates on the already-freed driver:
module_init(xhci_hcd_init)
xhci_hcd_init()
xhci_dbc_init() [return value ignored]
dbc_tty_init()
tty_register_driver() fails
tty_driver_kref_put() -> driver freed
(dbc_tty_driver left dangling)
...
module_exit(xhci_hcd_fini)
xhci_hcd_fini()
xhci_dbc_exit()
dbc_tty_exit()
if (dbc_tty_driver) -> true (dangling)
tty_unregister_driver() -> use-after-free
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/usb/host/xhci-dbgtty.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "01b7bc0938061f2fd46e0094f6483d8c6c02f7d3",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "43635ff6401ca0e0ed21875379eeded921321525",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "eaca2814f32b9872a332326324b9e83e01f156d2",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "943f976c93e70563b132f5585ff68b08c89641a2",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "33ed35ca629477f57e0dd1d77d6df96cf5a9eb55",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "0e469b94fbba8eb03666da41dd1082b793c50c1a",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
},
{
"lessThan": "a916fa66a43e10f63198b6ce978badffc678821a",
"status": "affected",
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/usb/host/xhci-dbgtty.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"lessThan": "5.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxhci: dbgtty: Fix unregister on tty_register_driver() failure\n\nIf tty_register_driver() fails, it drops the reference, but fails to set\nthe global dbc_tty_driver to NULL, causing the unregister to be called\nagain when module exits.\n\nOn module unload dbc_tty_exit() only gates its cleanup on the driver\npointer being non-NULL, so it operates on the already-freed driver:\n\n module_init(xhci_hcd_init)\n xhci_hcd_init()\n xhci_dbc_init() [return value ignored]\n dbc_tty_init()\n tty_register_driver() fails\n tty_driver_kref_put() -\u003e driver freed\n (dbc_tty_driver left dangling)\n ...\n module_exit(xhci_hcd_fini)\n xhci_hcd_fini()\n xhci_dbc_exit()\n dbc_tty_exit()\n if (dbc_tty_driver) -\u003e true (dangling)\n tty_unregister_driver() -\u003e use-after-free"
}
],
"id": "CVE-2026-80923",
"lastModified": "2026-09-09T17:17:47.507",
"metrics": {},
"published": "2026-09-09T17:17:47.507",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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