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Ubuntu 26.04 Net--CIDR--Lite Major Access Management Upgrade USN-8406-1

Several security issues were fixed in Net::CIDR::Lite.. ========================================================================== Ubuntu Security Notice USN-8406-1 June 08, 2026 libnet-cidr-lite-perl vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in Net::CIDR::Lite. Software Description: - libnet-cidr-lite-perl: module for merging IPv4 or IPv6 CIDR address ranges Details: Dave Rolsky discovered that Net::CIDR::Lite did not properly handle extraneous zero characters at the beginning of an IP address string. A remote attacker could possibly use this issue to bypass access controls that are based on IP addresses. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2021-47154) It was discovered that Net::CIDR::Lite did not properly validate the IPv6 group count when handling uncompressed IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls. (CVE-2026-40198) It was discovered that Net::CIDR::Lite mishandled IPv4 mapped IPv6 addresses. A remote attacker could possibly use this issue to bypass access controls that are based on IP addresses. (CVE-2026-40199) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libnet-cidr-lite-perl 0.22-2ubuntu0.26.04.1 Ubuntu 25.10 libnet-cidr-lite-perl 0.22-2ubuntu0.25.10.1 Ubuntu 24.04 LTS libnet-cidr-lite-perl 0.22-2ubuntu0.24.04.1 Ubuntu 22.04 LTS libnet-cidr-lite-perl 0.22-1ubuntu0.1 Ubuntu 20.04 LTS libnet-cidr-lite-perl 0.21-2ubuntu0.1+esm1 Available with Ubuntu Pro Ubuntu 18.04 LTS libnet-cidr-lite-perl 0.21-1ubuntu0.18.04.1~esm1 Available with Ubuntu Pro Ubuntu 16.04 LTS libnet-cidr-lite-perl 0.21-1ubuntu0.16.04.1~esm1 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8406-1 CVE-2021-47154, CVE-2026-40198, CVE-2026-40199 Package Information: https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-2ubuntu0.26.04.1 https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-2ubuntu0.25.10.1 https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-2ubuntu0.24.04.1 https://launchpad.net/ubuntu/+source/libnet-cidr-lite-perl/0.22-1ubuntu0.1 . Explore critical security fixes for Net::CIDR::Lite in Ubuntu releases, addressing IP address handling issues effectively.. Ubuntu Security, Net::CIDR::Lite, IP Address Security, IPv4 IPv6 Handling, Access Control Issues. . Severity: Important. LinuxSecurity.com Team

Jun 08, 2026 •Important Ubuntu