Linux Kernel CVE-2026-43339

Upgrade to patched kernel versions: 5.10.253+ for 5.10.y LTS branch, 5.15.203+ for 5.15.y LTS, 6.1.168+ for 6.1.y LTS, 6.6.134+ for 6.6.y stable, 6.12.81+ for 6.12.y, 6.18.22+ for 6.18.y, 6.19.12+ for 6.19.y, or 7.0+ for mainline. Consult distribution-specific security advisories as downstream vendors (RHEL, Ubuntu, SUSE, Debian) may backport fixes with different version numbers. For systems unable to patch immediately, implement defense-in-depth by restricting local user access, enforcing strict user permission boundaries, and enabling kernel hardening features (SELinux, AppArmor, seccomp). Monitor for privilege escalation attempts via audit logging of syscall activity in IPv6 networking paths. Compensating controls provide minimal risk reduction since the vulnerability requires existing local access - no network-level firewall or service disablement mitigations apply. Container and virtualization environments should prioritize patching due to shared kernel attack surface across tenant boundaries. Kernel live-patching services (kpatch, kGraft, Ksplice) may provide zero-downtime fixes for enterprise deployments.