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CVE-2026-46056: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-19
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers hci_conn lookup and field access must be covered by hdev lock in hci_user_passkey_notify_evt() and hci_keypress_notify_evt(), otherwise the connection can be freed concurrently. Extend the hci_dev_lock critical section to cover all conn usage in both handlers. Keep the existing keypress notification behavior unchanged by routing the early exits through a common unlock path.

Affected products

• Linux kernel: from 3.7 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.86; from 6.13 before 6.18.27; from 6.19 before 7.0.4 — fixed in 6.1.175, 6.12.86, 6.18.27, 6.6.140, 7.0.4

How to fix

Upgrade to a fixed version: Linux kernel 6.1.175, 6.12.86, 6.18.27, 6.6.140. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/01a6431766c35dfedb86e0cb5d3fc80c6d604a47
• https://git.kernel.org/stable/c/204028af77a265e31ceb4ba7f643349a3cca72b2
• https://git.kernel.org/stable/c/85fa3512048793076eef658f66489112dcc91993
• https://git.kernel.org/stable/c/8c6443bb9257b780986fb67ec08565bf48ecb8d7
• https://git.kernel.org/stable/c/b6ae482f88654db407c8c17619d4b62959b903ef
• https://git.kernel.org/stable/c/d28311539ac9f65e29308ea219ecaa48aa5e76e5
• https://git.kernel.org/stable/c/e08d75753db17aa943d7622f09d9c217b5bfd3b8
• https://git.kernel.org/stable/c/ea18732d2614557e59f4c0d8cdbe6611aeab33b7
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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