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Vulnerability record · CVE-2026-46056 · published 27 May 2026

CVE-2026-46056: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.41% · top 67.1% CWE-416 · Use after free
8.8CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
19 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/01a6431766c35dfedb86e0cb5d3fc80c6d604a47 Patch
https://git.kernel.org/stable/c/204028af77a265e31ceb4ba7f643349a3cca72b2 Patch
https://git.kernel.org/stable/c/85fa3512048793076eef658f66489112dcc91993 Patch
https://git.kernel.org/stable/c/8c6443bb9257b780986fb67ec08565bf48ecb8d7 Patch
https://git.kernel.org/stable/c/b6ae482f88654db407c8c17619d4b62959b903ef Patch
https://git.kernel.org/stable/c/d28311539ac9f65e29308ea219ecaa48aa5e76e5
https://git.kernel.org/stable/c/e08d75753db17aa943d7622f09d9c217b5bfd3b8 Patch
https://git.kernel.org/stable/c/ea18732d2614557e59f4c0d8cdbe6611aeab33b7

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Source: NIST National Vulnerability Database (record CVE-2026-46056), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.