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xhci: dbgtty: Fix unregister on tty_register_driver() failure

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-80923

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80923

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "01b7bc0938061f2fd46e0094f6483d8c6c02f7d3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "43635ff6401ca0e0ed21875379eeded921321525",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "eaca2814f32b9872a332326324b9e83e01f156d2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "943f976c93e70563b132f5585ff68b08c89641a2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "0d0faf3cc44c4d86fc6faf5cea972c0fbe00b922",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "33ed35ca629477f57e0dd1d77d6df96cf5a9eb55",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "0e469b94fbba8eb03666da41dd1082b793c50c1a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4521f16139409cdf9462c7325d43454462cff6c3",
        "lessThan": "a916fa66a43e10f63198b6ce978badffc678821a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/usb/host/xhci-dbgtty.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.220",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.187",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.156",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.108",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.49",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/usb/host/xhci-dbgtty.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80923

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34884 · Revision 1
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Publisher date
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