CVE-2026-80923xhci: dbgtty: Fix unregister on tty_register_driver() failure
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 40 days later
· 40 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < 43635ff6401ca0e0ed21875379eeded921321525
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < eaca2814f32b9872a332326324b9e83e01f156d2
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < 943f976c93e70563b132f5585ff68b08c89641a2
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < 0e469b94fbba8eb03666da41dd1082b793c50c1a
- affected 4521f16139409cdf9462c7325d43454462cff6c3 – < a916fa66a43e10f63198b6ce978badffc678821a
- affected 5.9
- unaffected < 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.*
- unaffected 6.18.49 – ≤ 6.18.*
- unaffected 7.1.13 – ≤ 7.1.*
- unaffected 7.2.3 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 (opens in a new tab)
- https://git.kernel.org/stable/c/43635ff6401ca0e0ed21875379eeded921321525 (opens in a new tab)
- https://git.kernel.org/stable/c/eaca2814f32b9872a332326324b9e83e01f156d2 (opens in a new tab)
- https://git.kernel.org/stable/c/943f976c93e70563b132f5585ff68b08c89641a2 (opens in a new tab)
- https://git.kernel.org/stable/c/0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 (opens in a new tab)
- https://git.kernel.org/stable/c/33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 (opens in a new tab)
- https://git.kernel.org/stable/c/0e469b94fbba8eb03666da41dd1082b793c50c1a (opens in a new tab)
- https://git.kernel.org/stable/c/a916fa66a43e10f63198b6ce978badffc678821a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-75100 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80923)Record last updated .