CVE-2026-80923 (GCVE-0-2026-80923)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:19 – Updated: 2026-09-09 16:19
VLAI
EPSS
VEX
Title
xhci: dbgtty: Fix unregister on tty_register_driver() failure
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
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4521f16139409cdf9462c7325d43454462cff6c3 , < 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3
(git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 43635ff6401ca0e0ed21875379eeded921321525 (git) Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < eaca2814f32b9872a332326324b9e83e01f156d2 (git) Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 943f976c93e70563b132f5585ff68b08c89641a2 (git) Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 (git) Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 (git) Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 0e469b94fbba8eb03666da41dd1082b793c50c1a (git) Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < a916fa66a43e10f63198b6ce978badffc678821a (git) |
guessed | |
| Linux | Linux |
Affected:
5.9
Unaffected: 0 , < 5.9 (semver) Unaffected: 5.15.220 , ≤ 5.15.* (semver) Unaffected: 6.1.187 , ≤ 6.1.* (semver) Unaffected: 6.6.156 , ≤ 6.6.* (semver) Unaffected: 6.12.108 , ≤ 6.12.* (semver) Unaffected: 6.18.49 , ≤ 6.18.* (semver) Unaffected: 7.1.13 , ≤ 7.1.* (semver) Unaffected: 7.2.3 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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{
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"product": "Linux",
"programFiles": [
"drivers/usb/host/xhci-dbgtty.c"
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{
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"versionType": "git"
},
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]
},
{
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"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"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.220",
"versionStartIncluding": "5.9",
"vulnerable": true
},
{
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"versionEndExcluding": "6.1.187",
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},
{
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"versionEndExcluding": "6.6.156",
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},
{
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},
{
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"versionEndExcluding": "7.1.13",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
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],
"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"
}
],
"providerMetadata": {
"dateUpdated": "2026-09-09T16:19:43.538Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3"
},
{
"url": "https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525"
},
{
"url": "https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2"
},
{
"url": "https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2"
},
{
"url": "https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922"
},
{
"url": "https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55"
},
{
"url": "https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a"
},
{
"url": "https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a"
}
],
"title": "xhci: dbgtty: Fix unregister on tty_register_driver() failure",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80923",
"datePublished": "2026-09-09T16:19:43.538Z",
"dateReserved": "2026-08-26T14:34:25.801Z",
"dateUpdated": "2026-09-09T16:19:43.538Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-80923\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-09T17:17:47.507\",\"lastModified\":\"2026-09-09T17:17:47.507\",\"vulnStatus\":\"Received\",\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/host/xhci-dbgtty.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"01b7bc0938061f2fd46e0094f6483d8c6c02f7d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"43635ff6401ca0e0ed21875379eeded921321525\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"eaca2814f32b9872a332326324b9e83e01f156d2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"943f976c93e70563b132f5585ff68b08c89641a2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"33ed35ca629477f57e0dd1d77d6df96cf5a9eb55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"0e469b94fbba8eb03666da41dd1082b793c50c1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4521f16139409cdf9462c7325d43454462cff6c3\",\"lessThan\":\"a916fa66a43e10f63198b6ce978badffc678821a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/host/xhci-dbgtty.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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