{"id":"CVE-2026-80923","state":"PUBLISHED","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","publishedAt":"2026-09-09T16:19:43.538Z","updatedAt":"2026-10-19T08:45:07.298Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"43635ff6401ca0e0ed21875379eeded921321525","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"eaca2814f32b9872a332326324b9e83e01f156d2","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"943f976c93e70563b132f5585ff68b08c89641a2","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"0e469b94fbba8eb03666da41dd1082b793c50c1a","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"a916fa66a43e10f63198b6ce978badffc678821a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/host/xhci-dbgtty.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/host/xhci-dbgtty.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80923.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80923","state":"PUBLISHED","datePublished":"2026-09-09T16:19:43.538Z","dateUpdated":"2026-10-19T08:45:07.298Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.801Z"},"containers":{"cna":{"title":"xhci: dbgtty: Fix unregister on tty_register_driver() failure","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"43635ff6401ca0e0ed21875379eeded921321525","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"eaca2814f32b9872a332326324b9e83e01f156d2","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"943f976c93e70563b132f5585ff68b08c89641a2","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"0e469b94fbba8eb03666da41dd1082b793c50c1a","versionType":"git"},{"version":"4521f16139409cdf9462c7325d43454462cff6c3","status":"affected","lessThan":"a916fa66a43e10f63198b6ce978badffc678821a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/host/xhci-dbgtty.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/host/xhci-dbgtty.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:45:07.298Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"5.15.220"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.1.187"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.12.108"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.18.49"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.1.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}