// #linux-kernel
4 articles
CVE-2026-23111 Detection and Hardening Guide: Protecting Linux Environments from the nf_tables Exploit
With public proof-of-concept code available for CVE-2026-23111, security teams running Linux across production, containerised, and cloud environments need specific detection and hardening guidance. This guide covers kernel patch availability by distribution, interim mitigations, eBPF-based detection, and Kubernetes-specific containment measures.
Linux Kernel CVE-2026-23111: nf_tables Use-After-Free Enables Container Escape and Root Privilege Escalation
A use-after-free vulnerability in the Linux kernel's nf_tables netfilter subsystem allows unprivileged users to escalate to root and break container isolation. Public proof-of-concept code published 9 June makes this an immediate remediation priority across all major Linux distributions running kernel versions 5.15 through 6.10.
Linux CopyFail LPE Added to CISA KEV With Active Exploitation Confirmed — CVE-2026-31431
CISA has added CVE-2026-31431 — the Linux kernel copy-on-write race condition LPE disclosed last week as 'CopyFail' — to the Known Exploited Vulnerabilities catalogue following confirmed active exploitation. All major Linux distributions have patches available. Federal agencies face a May 20 remediation deadline and all enterprise organisations should treat kernel patching as urgent.
Linux Kernel nf_tables Use-After-Free CVE-2026-23231 Enables Privilege Escalation on Most Distributions
A use-after-free vulnerability in the Linux kernel's nf_tables netfilter subsystem allows a local attacker to escalate privileges to root on unpatched systems. CVE-2026-23231 affects kernels 5.14 through 6.9 and most major distributions including RHEL 9, Ubuntu 22.04/24.04, Debian 12, and SLES 15. Stable kernel patches are available and distribution security teams are issuing advisories.