CISA Adds Two Known Exploited Vulnerabilities to Catalog

What happened

CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2025-39964 Linux Kernel Race Condition Vulnerability CVE-2026-53266 Linux Kernel Out-of-Bounds Write Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise.

BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.