CVE-2026-23146 (GCVE-0-2026-23146)
Vulnerability from cvelistv5 – Published: 2026-02-14 16:01 – Updated: 2026-06-11 18:44
VLAI
EPSS
VEX
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
7 references
Impacted products
2 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 | |
| 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 |
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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": {
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"cvssData": {
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"integrityImpact": "NONE",
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"scope": "UNCHANGED",
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"timestamp": "2026-06-10T20:41:53.104941Z",
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"published": "2026-02-14T16:15:54.703",
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"weaknesses": [
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"description": [
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"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
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"current_release_date": "2026-07-08T12:22:23+00:00",
"cve": "CVE-2026-23146",
"id": "CVE-2026-23146",
"initial_release_date": "2026-02-14T00:00:00+00:00",
"product_status:fixed": "612",
"product_status:known_affected": "36",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Denial of Service in Bluetooth HCI UART driver via null pointer dereference",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23146.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-07-24T02:39:15Z",
"cve": "CVE-2026-23146",
"id": "CVE-2026-23146",
"initial_release_date": "2026-02-16T00:26:15Z",
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"product_status:recommended": "378",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-23146",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-23146.json",
"version": "28"
},
"vulnrichment": {
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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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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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