Description

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) ------

References 8

• git.kernel.org https://git.kernel.org/stable/c/11cd7e068381666f842ad41d1cc58eecd0c75237
• git.kernel.org https://git.kernel.org/stable/c/3b78f50918276ab28fb22eac9aa49401ac436a3b
• git.kernel.org https://git.kernel.org/stable/c/4ebb90c3c309e6375dc3e841af92e2a039843e62
• git.kernel.org https://git.kernel.org/stable/c/70d84e7c3a44b81020a3c3d650a64c63593405bd
• git.kernel.org https://git.kernel.org/stable/c/973e0271754c77db3e1b6b69adf2de85a79a4c8b
• git.kernel.org https://git.kernel.org/stable/c/c24ac6cfe4f9a47180a65592c47e7a310d2f9d93
• git.kernel.org https://git.kernel.org/stable/c/d566e9a2bfc848941b091ffd5f4e12c4e889d818
• git.kernel.org https://git.kernel.org/stable/c/ea46a1d217bc82e01cf3d0424e50ebfe251e34bf

Remediation