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CISA flags actively exploited ‘Copy Fail’ Linux kernel flaw enabling root takeover across major distros — unpatched systems may remain vulnerable to attack

… Cybersecurity and Infrastructure Security Agency CISA added a newly disclosed Linux vulnerability, dubbed “Copy Fail,” to its Known Exploited Vulnerabilities catalog on May 1st, warning that the flaw, tracked as CVE-2026-31431, is already being used in active attacks and urging rapid patching acros… …

May 4, 2026 · Etiido Uko