CISA adds actively exploited Linux kernel vulnerability CVE-2026-43456 to KEV

CISA has added CVE-2026-43456, a Linux kernel local privilege escalation vulnerability, to its Known Exploited Vulnerabilities (KEV) catalog after confirming active exploitation in the wild. Here's a technical summary covering the vulnerability, affected kernel versions, exploitation requirements, upstream fixes, vendor advisories, and practical mitigation guidance. Interested to hear if anyone has additional technical analysis or insights into exploitation in real-world environments.