CVE-2026-80923
xhci: dbgtty: Fix unregister on tty_register_driver() failure
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
INFO
Published Date :
Sept. 9, 2026, 4:19 p.m.
Last Modified :
Sept. 9, 2026, 4:19 p.m.
Remotely Exploit :
No
Source :
Linux
Affected Products
The following products are affected by CVE-2026-80923
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to include the fix.
- Ensure the driver pointer is set to NULL on failure.
- Verify correct reference counting for the TTY driver.
- Test module load and unload sequences.
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