{"id":"CVE-2026-80923","summary":"xhci: dbgtty: Fix unregister on tty_register_driver() failure","details":"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","modified":"2026-09-10T03:48:32.776536367Z","published":"2026-09-09T16:19:43.538Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80923.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55"},{"type":"WEB","url":"https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525"},{"type":"WEB","url":"https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80923.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80923"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4521f16139409cdf9462c7325d43454462cff6c3"},{"fixed":"01b7bc0938061f2fd46e0094f6483d8c6c02f7d3"},{"fixed":"43635ff6401ca0e0ed21875379eeded921321525"},{"fixed":"eaca2814f32b9872a332326324b9e83e01f156d2"},{"fixed":"943f976c93e70563b132f5585ff68b08c89641a2"},{"fixed":"0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922"},{"fixed":"33ed35ca629477f57e0dd1d77d6df96cf5a9eb55"},{"fixed":"0e469b94fbba8eb03666da41dd1082b793c50c1a"},{"fixed":"a916fa66a43e10f63198b6ce978badffc678821a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80923.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"5.15.220"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.187"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.156"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.108"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.49"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.13"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80923.json"}}],"schema_version":"1.9.0"}