In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix potential uninit-value access in _ip6makeskb() As it was done in commit fc1092f51567 ("ipv4: Fix uninit-value access in _ipmakeskb()") for IPv4, check FLOWIFLAGKNOWNNH on fl6->flowi6flags instead of testing HDRINCL on the socket to avoid a race condition which causes uninit-value access.