CVE-2022-49754 Information

Description

In the Linux kernel the following vulnerability has been resolved:

Bluetooth: Fix a buffer overflow in mgmt_mesh_add()

Smatch Warning: net/bluetooth/mgmt_util.c:375 mgmt_mesh_add() error: __memcpy() ‘mesh_tx->param’ too small (48 vs 50)

Analysis:

‘mesh_tx->param’ is array of size 48. This is the destination. u8 param[sizeof(struct mgmt_cp_mesh_send) + 29]; // 19 + 29 = 48.

But in the caller ‘mesh_send’ we reject only when len > 50. len > (MGMT_MESH_SEND_SIZE + 31) // 19 + 31 = 50.

Reference

https://git.kernel.org/stable/c/2185e0fdbb2137f22a9dd9fcbf6481400d56299b https://git.kernel.org/stable/c/ed818fd8c531abf561b379995ee7cc4c68029464