Assuming
a secret key $s\in \mathbb{Z}_2[X]/\langle X^n+1\rangle$,
a plaintext $m\in \mathbb{Z}_2[X]/\langle X^n+1\rangle$,
$e,e'$ are sampled from B-bounded Discrete Gaussian Distribution over $\mathbb{Z}[X]/\langle X^n+1 \rangle $ with reasonable standard deviation for security.
$a$ (a part of public key) is a random element sampled unformly at random from $\mathbb{Z}_q[X]/\langle X^n+1\rangle$ (q >> 2),
$b=[-a \cdot s-e]_q$ (a part of public key)
$u$ is an element over $\mathbb{Z}_2[X]/\langle X^n+1\rangle$ (with small coefficient).
Then, is the following RLWE sample secure?
$([u \cdot b + 2 \cdot e' + m]_q, [u \cdot a]_q)$
