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

Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-05-23 16:03
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.
Assigner
References
Impacted products
Vendor Product Version
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)
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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)
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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/ccc683f597ceb28deb966427ae948e5ac739a909"
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        {
          "url": "https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398"
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      "title": "Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work",
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    "cveId": "CVE-2026-23146",
    "datePublished": "2026-02-14T16:01:16.169Z",
    "dateReserved": "2026-01-13T15:37:45.974Z",
    "dateUpdated": "2026-05-23T16:03:57.936Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23146\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T16:15:54.703\",\"lastModified\":\"2026-03-17T21:13:01.070\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.293\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"4D6F83CA-7E5C-4A91-9D8C-71CC85535E7D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.237\",\"versionEndExcluding\":\"5.10.249\",\"matchCriteriaId\":\"339F6FF4-79D2-49BC-9E0D-68FB6F1201E9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.181\",\"versionEndExcluding\":\"5.15.199\",\"matchCriteriaId\":\"FDF3BBC9-1D58-4300-AD4C-591A4919AAC0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.135\",\"versionEndExcluding\":\"6.1.162\",\"matchCriteriaId\":\"B08612A5-165F-449C-B5B5-6830D99A6A48\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.88\",\"versionEndExcluding\":\"6.6.123\",\"matchCriteriaId\":\"0D79ED79-3597-4CCE-95EF-DED9FD319AA1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12.24\",\"versionEndExcluding\":\"6.12.69\",\"matchCriteriaId\":\"D8AE027B-66A3-434F-AC67-50F44A6A41EF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13.12\",\"versionEndExcluding\":\"6.14\",\"matchCriteriaId\":\"A1F1E5FF-68CB-46CE-BC4F-8E19FA72A921\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.14.3\",\"versionEndExcluding\":\"6.18.9\",\"matchCriteriaId\":\"0FBCCA71-8616-4922-B963-927778DB4B44\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"17B67AA7-40D6-4AFA-8459-F200F3D7CFD1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C47E4CC9-C826-4FA9-B014-7FE3D9B318B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F71D92C0-C023-48BD-B3B6-70B638EEE298\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"13580667-0A98-40CC-B29F-D12790B91BDB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3EF854A1-ABB1-4E93-BE9A-44569EC76C0D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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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.