CVE-2026-80923
Full vulnerability record from the local CVENow database.
Description
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
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-09 17:17:47.507000
Last modified
2026-10-19 09:17:23.200000
View original CVE JSON
{
"id": "CVE-2026-80923",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-09T17:17:47.507",
"lastModified": "2026-10-19T09:17:23.200",
"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() -> 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) -> true (dangling)\n tty_unregister_driver() -> 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"
},
{
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"lessThan": "943f976c93e70563b132f5585ff68b08c89641a2",
"versionType": "git",
"status": "affected"
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{
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"versionType": "git",
"status": "affected"
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{
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"lessThan": "33ed35ca629477f57e0dd1d77d6df96cf5a9eb55",
"versionType": "git",
"status": "affected"
},
{
"version": "4521f16139409cdf9462c7325d43454462cff6c3",
"lessThan": "0e469b94fbba8eb03666da41dd1082b793c50c1a",
"versionType": "git",
"status": "affected"
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{
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"versionType": "git",
"status": "affected"
}
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},
{
"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",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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},
{
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},
{
"url": "https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55",
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},
{
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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{
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}