CVE-2025-40282

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: 6lowpan: reset link-local header on ipv6 recv path

Bluetooth 6lowpan.c netdev has header_ops, so it must set link-local header for RX skb, otherwise things crash, eg. with AF_PACKET SOCK_RAW

Add missing skb_reset_mac_header() for uncompressed ipv6 RX path.

For the compressed one, it is done in lowpan_header_decompress().

Log: (BlueZ 6lowpan-tester Client Recv Raw - Success)

kernel BUG at net/core/skbuff.c:212! Call Trace: <IRQ> ... packet_rcv (net/packet/af_packet.c:2152) ... <TASK> __local_bh_enable_ip (kernel/softirq.c:407) netif_rx (net/core/dev.c:5648) chan_recv_cb (net/bluetooth/6lowpan.c:294 net/bluetooth/6lowpan.c:359)

This vulnerability does not affect Red Hat Enterprise Linux as the Bluetooth 6LoWPAN functionality is not enabled in supported kernels. Exploitation requires receiving uncompressed IPv6 traffic over a Bluetooth network interface, which could lead to a kernel crash. Because support for this network interface is omitted from standard Red Hat builds, systems running default configurations are not exposed to this risk.