Mysql server in linux( wierd access)?

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Linux

MySQL

Ubuntu

hello everybody
my question is simple theoretical question:
so in linux i installed mysql server with
apt-get install mysql-server and all things worked well
after i run mysql_secure_installation commande to set up the security
but the probleme:
i can log in to root user ith wrong password
example: user=root,password=123
whene i run this commande:
mysql -u root -p
then (false password)
didn't give me an error i can access with false password

please i need an answer to this and thanks.

What I have tried:

hello everybody
my question is simple theoretical question:
so in linux i installed mysql server with
apt-get install mysql-server and all things worked well
after i run mysql_secure_installation commande to set up the security
but the probleme:
i can log in to root user ith wrong password
example: user=root,password=123
whene i run this commande:
mysql -u root -p
then (false password)
didn't give me an error i can access with false password

please i need an answer to this and thanks.