CISA Flags Three Linux Kernel Vulnerabilities Exploited in the Wild

CISA Flags Three Linux Kernel Vulnerabilities Exploited in the Wild Ravie LakshmananSep 19, 2026Vulnerability / Linux The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added three security flaws impacting the Linux kernel to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerabilities are listed below – CVE-2025-39682 (CVSS score: 9.8) – An improper check for unusual or exceptional conditions vulnerability in the TLS receive path that could allow local authenticated users to trigger memory disclosure or denial-of-service (DoS). CVE-2026-53266 (CVSS score: 8.8) – An out-of-bounds write vulnerability in the ebtables Source Network Address Translation (SNAT) Address Resolution Protocol (ARP) rewrite path that could allow a local attacker to trigger unintended system behavior, DoS, or…