{"api_version":"1","generated_at":"2026-09-10T22:38:08+00:00","cve":"CVE-2026-80923","urls":{"html":"https://cve.report/CVE-2026-80923","api":"https://cve.report/api/cve/CVE-2026-80923.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80923","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80923"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-09 17:17:47","updated_at":"2026-09-09 17:17:47"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","name":"https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","name":"https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a","name":"https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2","name":"https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a","name":"https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","name":"https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525","name":"https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2","name":"https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80923","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80923","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 43635ff6401ca0e0ed21875379eeded921321525 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 eaca2814f32b9872a332326324b9e83e01f156d2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 943f976c93e70563b132f5585ff68b08c89641a2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 0e469b94fbba8eb03666da41dd1082b793c50c1a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4521f16139409cdf9462c7325d43454462cff6c3 a916fa66a43e10f63198b6ce978badffc678821a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.220 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.187 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.156 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.108 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.49 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.13 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.3 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.220","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.187","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.156","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.108","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.49","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.13","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.3","versionStartIncluding":"5.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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"}],"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":{"engine":"bippy-1.2.0"}}},"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"},"nvd":{"publishedDate":"2026-09-09 17:17:47","lastModifiedDate":"2026-09-09 17:17:47","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80923","Ordinal":"1","Title":"xhci: dbgtty: Fix unregister on tty_register_driver() failure","CVE":"CVE-2026-80923","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80923","Ordinal":"1","NoteData":"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","Type":"Description","Title":"xhci: dbgtty: Fix unregister on tty_register_driver() failure"}]}}}