CISA warns “Copy Fail” Linux flaw is already actively exploited

The US Cybersecurity and Infrastructure Security Agency (CISA) has added a critical Linux kernel flaw known as “Copy Fail” to its Known Exploited Vulnerabilities (KEV) catalog. This confirms that the issue, tracked as CVE-2026-31431, is already being actively exploited in the wild just one day after public disclosure. CISA’s update places the vulnerability under the …

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