Critical Denial of Service Vulnerability in .NET on Ubuntu Systems

A critical vulnerability has been identified in .NET affecting multiple versions of Ubuntu, including 26.04 LTS and earlier releases. Discovered by Muhammad Abdul Rehman, the flaw allows specially crafted network traffic to cause excessive resource consumption, potentially leading to a denial of service. The vulnerability arises from improper handling of network requests, resulting in a loop without an exit condition. All users of affected Ubuntu versions are advised to update their systems to mitigate this risk. The issue impacts .NET CLI tools and runtimes across several versions. The recommended updates are available for immediate installation. Ubuntu Pro users benefit from extended security coverage for these packages. The vulnerability underscores the importance of timely system updates to maintain security.

Key Points: • .NET vulnerability allows denial of service through crafted network traffic. • Affected Ubuntu versions include 26.04 LTS, 25.10, 24.04 LTS, and 22.04 LTS. • Users are urged to update to the latest package versions to mitigate risks.