CVE-2026-46056
Analyzed Analyzed - Analysis Complete
Bluetooth UAF Fix in Linux Kernel Bluetooth Subsystem

Publication date: 2026-05-27

Last updated on: 2026-06-16

Assigner: kernel.org

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.
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Meta Information
Published
2026-05-27
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46056
EUVD
EUVD-2026-32438
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.7 (inc) to 6.12.86 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.140 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.27 (exc)
linux linux_kernel From 6.19 (inc) to 7.0.4 (exc)
linux linux_kernel From 3.7 (inc) to 6.1.175 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability exists in the Linux kernel's Bluetooth subsystem, specifically in the handling of Secure Simple Pairing (SSP) passkey events.

The issue arises because the lookup and access of a Bluetooth connection object (hci_conn) are not properly synchronized with the device lock (hdev lock) in two event handlers: hci_user_passkey_notify_evt() and hci_keypress_notify_evt().

Without this lock, the connection object can be freed concurrently while being accessed, leading to a potential Use-After-Free (UAF) vulnerability.

The fix involves extending the critical section protected by the hci_dev_lock to cover all usage of the connection object in both handlers, ensuring safe access and preventing concurrent freeing.

Impact Analysis

A Use-After-Free vulnerability in the Bluetooth subsystem can lead to undefined behavior, including potential system crashes, memory corruption, or exploitation by an attacker.

If exploited, it could allow an attacker to execute arbitrary code or cause denial of service on the affected Linux system.

The impact depends on the attacker's ability to trigger the vulnerable Bluetooth event handlers and the system's security context.

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