CVE-2026-64406
Received Received - Intake

BaseFortify

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-64406
EUVD
EUVD-2026-48950

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free (UAF) vulnerability in the Linux kernel's Bluetooth subsystem. It occurs in the bt_accept_dequeue() function where a temporary reference is dropped too early, leading to accessing freed memory during L2CAP socket cleanup. The issue arises when the final reference is dropped before the sock_hold() operation, which can cause memory corruption.

Detection Guidance

This vulnerability is specific to the Linux kernel's Bluetooth subsystem and may not have direct detection commands. Monitor kernel logs for Bluetooth-related crashes or KASAN reports indicating use-after-free in bt_accept_dequeue. Check for kernel oops or panics related to Bluetooth operations.

Impact Analysis

This vulnerability could allow an attacker to cause a denial-of-service (system crash) or potentially execute arbitrary code with kernel privileges. It affects systems using Bluetooth with L2CAP sockets, potentially leading to system instability or unauthorized access.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. If immediate patching is not possible, disable Bluetooth functionality temporarily to reduce exposure until the kernel is updated.

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