Arbitrary Memory Disclosure through CPU Side-Channel Attacks (Retbleed)

A vulnerability in Intel processors allows attackers to leak sensitive data from the computer's memory through a technique that exploits how processors handle return instructions. An unprivileged user can trigger this flaw to access confidential information like passwords or encryption keys.

This Spectre variant (Retbleed) bypasses retpoline mitigations on Intel microprocessors (generations 6-8) by hijacking return instructions to achieve speculative code execution. An unprivileged local attacker can leak arbitrary kernel or process memory by manipulating return address prediction under specific microarchitecture conditions, resulting in information disclosure.