Wire · regulatory
CISA Warns of Linux Kernel Vulnerabilities Actively Exploited in Attacks
◆ Sectors
◆ Geography
◆ Source
◆ Verified
Fusion42 · 20 September 2026 · Fusion42 review
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent warning about three actively exploited Linux kernel vulnerabilities, requiring federal agencies to patch by September 21, 2026, and conduct forensic investigations beyond just patching. The most critical flaw, CVE-2025-39682, affects kernel TLS receive path and can be triggered remotely on services using kTLS.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 2 sources have reported it between 19 Sep 2026 and 21 Sep 2026.
◆ ◆ The Wire takeaway
You face a federal deadline to patch Linux kernel severe flaws and conduct forensic reviews or lose market access in US government contracts. Prioritise kTLS-enabled services to avoid immediate compliance failures and possible breach aftermath.
◆ Coverage
2 sources · first reported 19 Sep 2026 · latest 21 Sep 2026
◆ Related on Wire
◆ Topics