An issue was discovered in the Linux kernel before 5.0.10. SMB2_negotiate in fs/cifs/smb2pdu.c has an out-of-bounds read because data structures are incompletely updated after a change from smb30 to smb21.
https://usn.ubuntu.com/4162-2/
https://usn.ubuntu.com/4162-1/
https://security.netapp.com/advisory/ntap-20191004-0001/
https://github.com/torvalds/linux/commit/b57a55e2200ede754e4dc9cce4ba9402544b9365
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.10