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CVE-2026-80923 (GCVE-0-2026-80923)

Vulnerability from cvelistv5 – Published: 2026-09-09 16:19 – Updated: 2026-09-09 16:19
VLAI
Title
xhci: dbgtty: Fix unregister on tty_register_driver() failure
Summary
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 01b7bc0938061f2fd46e0094f6483d8c6c02f7d3 (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 43635ff6401ca0e0ed21875379eeded921321525 (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < eaca2814f32b9872a332326324b9e83e01f156d2 (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 943f976c93e70563b132f5585ff68b08c89641a2 (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922 (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 33ed35ca629477f57e0dd1d77d6df96cf5a9eb55 (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < 0e469b94fbba8eb03666da41dd1082b793c50c1a (git)
Affected: 4521f16139409cdf9462c7325d43454462cff6c3 , < a916fa66a43e10f63198b6ce978badffc678821a (git)
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Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "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 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()           -\u003e 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)               -\u003e true (dangling)\n              tty_unregister_driver()         -\u003e use-after-free"
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-08-26T14:34:25.801Z",
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          }
        ],
        "id": "CVE-2026-80923",
        "lastModified": "2026-09-09T17:17:47.507",
        "metrics": {},
        "published": "2026-09-09T17:17:47.507",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:49:34Z",
      "cve": "CVE-2026-80923",
      "id": "CVE-2026-80923",
      "initial_release_date": "2026-09-10T01:49:34Z",
      "product_status:known_affected": "152",
      "product_status:known_not_affected": "201",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80923",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80923.json",
      "version": "2"
    }
  }
}



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