Local Privilege Escalation Vulnerability

A high-severity local privilege escalation vulnerability (CVE-2021-4034, "PwnKit") was disclosed in Polkit's pkexec, which is installed by default on most major Linux distributions and can allow local attackers to gain root. The advisory recommends immediate patching or temporary mitigation (removing the SUID bit), provides detection guidance (EDR/logging use-cases), notes PoCs are public but no confirmed in-the-wild exploitation yet, and links vendor patches and advisories.