Bluetooth: bnep: fix out-of-bounds reads on short RX/TX frames and control fallthrough

Overview

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

Bluetooth: bnep: fix out-of-bounds reads on short RX/TX frames and control fallthrough

Fix multiple out-of-bounds reads in Bluetooth BNEP frame processing:

1. In bnep_rx_frame() and bnep_ctrl_frame() (net/bluetooth/bnep/core.c), use pskb_may_pull() to verify the BNEP header, control type byte, filter count, and extension headers exist before reading them, and return 0 after handling BNEP_CONTROL instead of falling through to Ethernet frame submission when no extension headers follow.
2. In bnep_net_xmit() (net/bluetooth/bnep/netdev.c), verify skb->len >= ETH_HLEN with pskb_may_pull() before reading the 14-byte Ethernet header to prevent an out-of-bounds heap read and infoleak on short AF_PACKET TX frames.

Affected

• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7af80ad2cebfe2f1879d6a39a1aaa061d9c4e1ca
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 667aa703e11cdc237d169393bc6a5ea9acbb33c2
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3e605ff5932afe0970c2beca66f2f1ba2babe4dd
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 035f9b1809861967e58ce652680d70ea1502058f
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1e7aebc188f889b56c3aaeb6133ef6d77022c887
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8f31031326994d1abfcc6ebb6927ef96e51fb9ff
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ad0d2d4ada51321db787262ef343193c712b76b5
• Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f0ca020cbb9bb7f3f4ea8ba1dfcf30a282aec91e
• Linux 2.6.12

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.