{"id":"CVE-2026-80923","title":"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 NUL…","summary":"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 NUL…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < 43635ff6401ca0e0ed21875379eeded921321525","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < eaca2814f32b9872a332326324b9e83e01f156d2","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < 943f976c93e70563b132f5585ff68b08c89641a2","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < 0e469b94fbba8eb03666da41dd1082b793c50c1a","Linux >= 4521f16139409cdf9462c7325d43454462cff6c3 < a916fa66a43e10f63198b6ce978badffc678821a","Linux 5.9"],"published":"2026-09-09","updated":"2026-09-09","sourceUpdated":"2026-09-09T17:17:47.507","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80923","references":[{"url":"https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-09T17:16:03.090Z","epss":0.00165,"epssPercentile":0.06101,"slug":"CVE-2026-80923","body":"## Overview\n\nIn 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\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}