CVE-2026-80923
xhci: dbgtty: Fix unregister on tty_register_driver() failure
At a glance
- Source
- NVD
- EPSS
- EPSS 0.17 % · percentile 6 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: xhci: dbgtty: Fix unregister on tty_register_driver() failure If tty_register_driver() fails, it drops the reference, but fails to set the global dbc_tty_driver to NULL, causing the unregister to be called again when module exits. On module unload dbc_tty_exit() only gates its cleanup on the driver pointer being non-NULL, so it operates on the already-freed driver: module_init(xhci_hcd_init) xhci_hcd_init() xhci_dbc_init() [return value ignored] dbc_tty_init() tty_register_driver() fails tty_driver_kref_put() -> driver freed (dbc_tty_driver left dangling) ... module_exit(xhci_hcd_fini) xhci_hcd_fini() xhci_dbc_exit() dbc_tty_exit() if (dbc_tty_driver) -> true (dangling) tty_unregister_driver() -> use-after-free
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
European references
- ENISA EUVD · EUVD-2026-75100
- GCVE · GCVE-0-2026-80923
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 4521f16139409cdf9462c7325d43454462cff6c3 < 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 ; affected 4521f16139409cdf9462c7325d43454462cff6c3 < 43635ff6401ca0e0ed21875379eeded921321525 ; affected 4521f16139409cdf9462c7325d43454462cff6c3 < eaca2814f32b9872a332326324b9e83e01f156d2 ; affected 4521f16139409cdf9462c7325d43454462cff6c3 < 943f976c93e70563b132f5585ff68b08c89641a2 ; affected 4521f16139409cdf9462c7325d43454462cff6c3 < 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 ; affected 4521f16139409cdf9462c7325d43454462cff6c3 < 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 |
| Linux · Linux | affected 5.9 ; unaffected 0 < 5.9 ; unaffected 5.15.220 ≤ 5.15.* ; unaffected 6.1.187 ≤ 6.1.* ; unaffected 6.6.156 ≤ 6.6.* ; unaffected 6.12.108 ≤ 6.12.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |