Problem Description:
TLS 1.3 embeds the actual record type as the last non-zero byte
of the decrypted payload, optionally followed by zero padding. The
code which searches for the inner record type had an off-by-one bug
which could be triggered by an invalid frame, leading to an underflow
followed by an unconditional NULL pointer dereference, causing a
kernel panic.
Impact:
A remote TLS 1.3 peer can send a specially crafted record to
trigger a kernel panic, resulting in a Denial of Service (DoS).