CVE-2026-80923 is a vulnerability in Linux Kernel
Published on September 9, 2026
xhci: dbgtty: Fix unregister on tty_register_driver() failure
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
Products Associated with CVE-2026-80923
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Affected Versions
Linux:- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below 43635ff6401ca0e0ed21875379eeded921321525 is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below eaca2814f32b9872a332326324b9e83e01f156d2 is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below 943f976c93e70563b132f5585ff68b08c89641a2 is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below 0e469b94fbba8eb03666da41dd1082b793c50c1a is affected.
- Version 4521f16139409cdf9462c7325d43454462cff6c3 and below a916fa66a43e10f63198b6ce978badffc678821a is affected.
- Version 5.9 is affected.
- Before 5.9 is unaffected.
- Version 5.15.220, <= 5.15.* is unaffected.
- Version 6.1.187, <= 6.1.* is unaffected.
- Version 6.6.156, <= 6.6.* is unaffected.
- Version 6.12.108, <= 6.12.* is unaffected.
- Version 6.18.49, <= 6.18.* is unaffected.
- Version 7.1.13, <= 7.1.* is unaffected.
- Version 7.2.3, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.