Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work (Linux Linux)

CVE-2026-23146
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.13 % · centile 3 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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.

Faiblesses (CWE)

  • CWE-362 — Situation de compétition
  • CWE-476 — Déréférencement de pointeur nul

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected a40f94f7caa8d3421b64f63ac31bc0f24c890f39 < b0a900939e7e4866d9b90e9112514b72c451e873 ; affected 9e5a0f5777162e503400c70c6ed25fbbe2d38799 < ccc683f597ceb28deb966427ae948e5ac739a909 ; affected 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 < 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779 ; affected 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 < 186d147cf7689ba1f9b3ddb753ab634a84940cc9 ; affected 281782d2c6730241e300d630bb9f200d831ede71 < 53e54cb31e667fca05b1808b990eac0807d1dab0 ; affected 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 03e8c90c62233382042b7bd0fa8b8900552fdb62
Linux · Linuxaffected 6.15 ; unaffected 0 < 6.15 ; unaffected 5.10.249 ≤ 5.10.* ; unaffected 5.15.199 ≤ 5.15.* ; unaffected 6.1.162 ≤ 6.1.* ; unaffected 6.6.123 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD