Summary:
- Researchers have discovered a vulnerability in various operating systems, including Windows, macOS, and Linux, that allows attackers to downgrade the OS to an older, vulnerable version.
- The vulnerability, dubbed "OS Downgrade Attack," could potentially allow attackers to bypass security measures and gain unauthorized access to systems.
- The researchers have disclosed the vulnerability to the affected vendors, and it is recommended that users keep their operating systems up-to-date to mitigate the risk of this attack.