linux-kernel - [BUG] Bluetooth: Use-after-free in hci_uart_write

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Message-ID: <6969764f.170a0220.2b9fc4.35a7@mx.google.com>
Date: Fri, 16 Jan 2026 07:20:44 +0800
From: JiaHong Su <s11242586@...il.com>
To: Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] Bluetooth: Use-after-free in hci_uart_write_work

Hi,

Found a use-after-free in hci_uart_write_work when running Syzkaller on
Linux 6.19-rc5 (commit 0f61b18).

KASAN reports null-ptr-deref in the workqueue handler, looks like the
work wasn't cancelled before the structure got freed.

C reproducer and dmesg attached.

Thanks,
JiaHong Su

View attachment "repro.c" of type "text/x-csrc" (5412 bytes)

View attachment "report" of type "text/plain" (4708 bytes)