feature: screen - CVE-2023-24626 - privilege escalation


Add CVE-2023-24626 to the inventory.

When GNU Screen is installed with setuid or setgid (common on Linux/FreeBSD), local users can abuse its UNIX domain socket to send a privileged `SIGHUP` to any PID. This allows them to terminate arbitrary processes, causing a denial of service or disruption.

**Section:** ctf/system/screen/  
**Type:** local privilege escalation / denial of service  

