Executive brief
A security vulnerability has been identified in the Linux kernel's Bluetooth subsystem. This flaw could allow a local attacker to cause a system crash or potentially execute unauthorized actions by exploiting a timing issue during Bluetooth data processing. The issue specifically affects systems using Bluetooth ISO sockets, which are commonly used for advanced audio streaming.
Technical details
A use-after-free (UAF) vulnerability exists in net/bluetooth/iso.c within the iso_recv_frame function. The vulnerability is caused by a race condition where conn->sk is accessed after the iso_conn_lock is released without holding a proper reference count. A concurrent call to iso_sock_kill() can free the socket object while iso_recv_frame is still processing it, leading to a UAF during sk->sk_state checks or sock_queue_rcv_skb() operations. The fix implements proper reference counting using iso_sock_hold() while the lock is held to ensure the socket remains valid during processing.
Affected products
- Linux Linux kernel 6.0 to 7.0.11
Timeline
- 2026-07-19: advisory: NVD publication date
- 2026-05-28: patched: Initial fix committed to mainline kernel
References
- https://git.kernel.org/stable/c/119fb6f80c44dc1c65d604cf28e64c56bd9b6568
- https://git.kernel.org/stable/c/1a6b803b00ccdd7666506adbe01ddae1c72d1ca9
- https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878
- https://git.kernel.org/stable/c/b04ec131325baf4ea4577d6c6e6b86cf092e3731
- https://git.kernel.org/stable/c/c318aa51830a3d2cc1229968fe521441c97356cd
- https://git.kernel.org/stable/c/c57ea90f203c8b8b41a474f19a09000d0f841436