{"id":"CVE-2026-80923","revision":"967b7fdc388e48b59639dd6a05d6c4b3","records":[{"revision":"967b7fdc388e48b59639dd6a05d6c4b3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80923","aliases":[],"title":"xhci: dbgtty: Fix unregister on tty_register_driver() failure","description":"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","state":0,"publishedAt":"2026-09-09T16:19:43.538+00:00","modifiedAt":"2026-10-19T08:45:07.298+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/usb/host/xhci-dbgtty.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"01b7bc0938061f2fd46e0094f6483d8c6c02f7d3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"43635ff6401ca0e0ed21875379eeded921321525\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"eaca2814f32b9872a332326324b9e83e01f156d2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"943f976c93e70563b132f5585ff68b08c89641a2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"33ed35ca629477f57e0dd1d77d6df96cf5a9eb55\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"0e469b94fbba8eb03666da41dd1082b793c50c1a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4521f16139409cdf9462c7325d43454462cff6c3\",\n                            \"lessThan\": \"a916fa66a43e10f63198b6ce978badffc678821a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/usb/host/xhci-dbgtty.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.220\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.187\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.156\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.108\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.49\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.13\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.3\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525","https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2","https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2","https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a","https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80923","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80923","identifiers":["CVE-2026-80923"]},"retained":false,"historicalAffected":[]}],"coverage":[]}