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CVE-2026-23146 (GCVE-0-2026-23146)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-06-11 18:44
VLAI
Title
Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a40f94f7caa8d3421b64f63ac31bc0f24c890f39 , < b0a900939e7e4866d9b90e9112514b72c451e873 (git)
Affected: 9e5a0f5777162e503400c70c6ed25fbbe2d38799 , < ccc683f597ceb28deb966427ae948e5ac739a909 (git)
Affected: 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 , < 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779 (git)
Affected: 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 , < 186d147cf7689ba1f9b3ddb753ab634a84940cc9 (git)
Affected: 281782d2c6730241e300d630bb9f200d831ede71 , < 53e54cb31e667fca05b1808b990eac0807d1dab0 (git)
Affected: 5df5dafc171b90d0b8d51547a82657cd5a1986c7 , < 03e8c90c62233382042b7bd0fa8b8900552fdb62 (git)
Affected: 5df5dafc171b90d0b8d51547a82657cd5a1986c7 , < 0c3cd7a0b862c37acbee6d9502107146cc944398 (git)
Affected: 1dcf08fcff5ca529de6dc0395091f28854f4e54a (git)
Affected: 8e5aff600539e5faea294d9612cca50220e602b8 (git)
Affected: db7509fa110dd9b11134b75894677f30353b2c51 (git)
Affected: 5.10.237 , < 5.10.249 (semver)
Affected: 5.15.181 , < 5.15.199 (semver)
Affected: 6.1.135 , < 6.1.162 (semver)
Affected: 6.6.88 , < 6.6.123 (semver)
Affected: 6.12.24 , < 6.12.69 (semver)
Affected: 5.4.293 , < 5.5 (semver)
Affected: 6.13.12 , < 6.14 (semver)
Affected: 6.14.3 , < 6.15 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.123 , ≤ 6.6.* (semver)
Unaffected: 6.12.69 , ≤ 6.12.* (semver)
Unaffected: 6.18.9 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "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."
          }
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            {
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              "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."
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            },
            {
              "url": "https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398"
            }
          ],
          "title": "Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-23146",
        "datePublished": "2026-02-14T16:01:16.169Z",
        "dateReserved": "2026-01-13T15:37:45.974Z",
        "dateUpdated": "2026-06-11T18:44:17.179Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.