Linux+ labs
Every hands-on lab that maps to the CompTIA Linux+ (XK0-005) certification. This is the full lab package for that certification.
Certification: CompTIA › Linux+ XK0-005 clear · browse all certifications
4 labs
Expert
Root-Cause & Secure Configuration: CVE-2026-42945
Analyze CVE-2026-42945 at the source: understand the NGINX rewrite-module buffer-size miscalculation (CWE-131/122) and the upstream fix, reject a config change that only relocates the trigger, deploy a named-capture config, upgrade, add a WAF control, and verify with audit and vulnscan.
Expert
Root-Cause & Secure-Code Remediation: CVE-2025-32463
Fix CVE-2025-32463 at the source. Read the vulnerable sudo chroot setup, see how it loads nsswitch.conf from the user-supplied chroot dir while privileged (CWE-829), reject a world-writable check, load config from the trusted real root instead, retire the deprecated chroot feature in sudoers, and verify with audit and vulnscan.
Expert
Root-Cause Analysis & Kernel Hardening: CVE-2026-31431
Analyze CVE-2026-31431 at the source: understand the CWE-669 cross-sphere flaw in the kernel's AF_ALG AEAD interface and the out-of-place upstream fix, then patch and apply defense-in-depth hardening (module blacklist, restricted user namespaces) and verify the posture.
Expert
Root-Cause Analysis & Kernel Hardening: CVE-2026-43284 & CVE-2026-43500
Analyze two related Linux kernel CVEs (CVE-2026-43284 and CVE-2026-43500) at the source: recognize the shared root cause (in-place decryption over shared socket-buffer fragments) across IPsec/ESP and RxRPC, read both upstream fixes, then patch both with one update and apply defense-in-depth hardening for both subsystems, and verify.