FKIE_CVE-2026-23146

Vulnerability from fkie_nvd - Published: 2026-02-14 16:15 - Updated: 2026-06-17 10:20
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work hci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling hci_uart_register_dev(), which calls proto->open() to initialize hu->priv. However, if a TTY write wakeup occurs during this window, hci_uart_tx_wakeup() may schedule write_work before hu->priv is initialized, leading to a NULL pointer dereference in hci_uart_write_work() when proto->dequeue() accesses hu->priv. The race condition is: CPU0 CPU1 ---- ---- hci_uart_set_proto() set_bit(HCI_UART_PROTO_INIT) hci_uart_register_dev() tty write wakeup hci_uart_tty_wakeup() hci_uart_tx_wakeup() schedule_work(&hu->write_work) proto->open(hu) // initializes hu->priv hci_uart_write_work() hci_uart_dequeue() proto->dequeue(hu) // accesses hu->priv (NULL!) Fix this by moving set_bit(HCI_UART_PROTO_INIT) after proto->open() succeeds, ensuring hu->priv is initialized before any work can be scheduled.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work\n\nhci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling\nhci_uart_register_dev(), which calls proto-\u003eopen() to initialize\nhu-\u003epriv. However, if a TTY write wakeup occurs during this window,\nhci_uart_tx_wakeup() may schedule write_work before hu-\u003epriv is\ninitialized, leading to a NULL pointer dereference in\nhci_uart_write_work() when proto-\u003edequeue() accesses hu-\u003epriv.\n\nThe race condition is:\n\n  CPU0                              CPU1\n  ----                              ----\n  hci_uart_set_proto()\n    set_bit(HCI_UART_PROTO_INIT)\n    hci_uart_register_dev()\n                                    tty write wakeup\n                                      hci_uart_tty_wakeup()\n                                        hci_uart_tx_wakeup()\n                                          schedule_work(\u0026hu-\u003ewrite_work)\n      proto-\u003eopen(hu)\n        // initializes hu-\u003epriv\n                                    hci_uart_write_work()\n                                      hci_uart_dequeue()\n                                        proto-\u003edequeue(hu)\n                                          // accesses hu-\u003epriv (NULL!)\n\nFix this by moving set_bit(HCI_UART_PROTO_INIT) after proto-\u003eopen()\nsucceeds, ensuring hu-\u003epriv is initialized before any work can be\nscheduled."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_uart: correcci\u00f3n de desreferencia de puntero nulo en hci_uart_write_work\n\nhci_uart_set_proto() establece HCI_UART_PROTO_INIT antes de llamar a hci_uart_register_dev(), que llama a proto-\u0026gt;open() para inicializar hu-\u0026gt;priv. Sin embargo, si una activaci\u00f3n de escritura TTY ocurre durante esta ventana, hci_uart_tx_wakeup() puede programar write_work antes de que hu-\u0026gt;priv sea inicializado, lo que lleva a una desreferencia de puntero NULL en hci_uart_write_work() cuando proto-\u0026gt;dequeue() accede a hu-\u0026gt;priv.\n\nLa condici\u00f3n de carrera es:\n\n  CPU0                              CPU1\n  ----                              ----\n  hci_uart_set_proto()\n    set_bit(HCI_UART_PROTO_INIT)\n    hci_uart_register_dev()\n                                    activaci\u00f3n de escritura tty\n                                      hci_uart_tty_wakeup()\n                                        hci_uart_tx_wakeup()\n                                          schedule_work(\u0026amp;hu-\u0026gt;write_work)\n      proto-\u0026gt;open(hu)\n        // inicializa hu-\u0026gt;priv\n                                    hci_uart_write_work()\n                                      hci_uart_dequeue()\n                                        proto-\u0026gt;dequeue(hu)\n                                          // accede a hu-\u0026gt;priv (\u00a1NULL!)\n\nEsto se soluciona moviendo set_bit(HCI_UART_PROTO_INIT) despu\u00e9s de que proto-\u0026gt;open() se complete con \u00e9xito, asegurando que hu-\u0026gt;priv est\u00e9 inicializado antes de que se pueda programar cualquier trabajo."
    }
  ],
  "id": "CVE-2026-23146",
  "lastModified": "2026-06-17T10:20:59.047",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23146",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-10T20:41:53.104941Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-14T16:15:54.703",
  "references": [
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      "tags": [
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    },
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    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Detection rules are retrieved from Rulezet.