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Ubuntu 24.04 Net-CIDR Important Network Access Control Issue USN-8110-1

Net-CIDR could allow unintended access to network services.. ========================================================================== Ubuntu Security Notice USN-8110-1 March 18, 2026 libnet-cidr-perl vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Net-CIDR could allow unintended access to network services. Software Description: - libnet-cidr-perl: module for merging IPv4 or IPv6 CIDR address ranges Details: Dave Rolsky discovered that Net-CIDR did not properly sanitize IP addresses. An attacker could possibly use this to bypass IP-based restrictions. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS libnet-cidr-perl 0.21-2ubuntu0.2 Ubuntu 22.04 LTS libnet-cidr-perl 0.21-1ubuntu0.2 Ubuntu 20.04 LTS libnet-cidr-perl 0.20-1ubuntu0.1~esm2 Available with Ubuntu Pro Ubuntu 18.04 LTS libnet-cidr-perl 0.18-1ubuntu0.1~esm2 Available with Ubuntu Pro Ubuntu 16.04 LTS libnet-cidr-perl 0.17-1ubuntu0.16.04.1~esm2 Available with Ubuntu Pro Ubuntu 14.04 LTS libnet-cidr-perl 0.17-1ubuntu0.14.04.1~esm2 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8110-1 CVE-2021-4456 Package Information: https://launchpad.net/ubuntu/+source/libnet-cidr-perl/0.21-2ubuntu0.2 https://launchpad.net/ubuntu/+source/libnet-cidr-perl/0.21-1ubuntu0.2 . Net-CIDR vulnerability in Ubuntu could allow unauthorized network access. Update to protect your services.. ubuntu Net-CIDRaccess control IP vulnerabilities update. . LinuxSecurity.com Team

Mar 23, 2026 Ubuntu