OpenSSH through 9.6, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges.

This attack relies on a hardware platform defect to demonstrate a theoretical vulnerability against OpenSSH. Given that this issue requires conditions that are impractical in a real-world environment, a fix will not be provided for Amazon Linux 2 and Amazon Linux 2023 at this time.