In brief — July 6, 2026 · Updated Raspberry Pi OS moves to Linux 6.18 LTS with measured performance gains, per Phoronix. Raspberry Pi's rolling OS refresh has landed on the Linux 6.18 long-term support kernel, replacing the 6.12 series that shipped through the last update cycle. Phoronix's benchmarks show measurable improvements in I/O and thermal management across Pi 4 and Pi 5 boards.
What happened
The Raspberry Pi OS team pushed the Linux 6.18 LTS kernel to the stable channel this week. Existing installs receive the kernel through the normal apt update path — no reinstall required. Phoronix's coverage focuses on three areas where 6.18 lands cleanly: block-device I/O throughput (improvements from newer NVMe and USB attached SCSI code paths), thermal management (better DVFS behavior on Pi 5 boards under sustained load), and a handful of scheduler tweaks that help homelab-style multi-process workloads.
The kernel drop is timed with the LTS series' formal release, so it will receive backported bug fixes and security patches for the next several years — meaningful for the Raspberry Pi 4 Model B 8GB and later boards that get deployed as always-on services. Older platforms including the Raspberry Pi Zero W receive the update too, though the workloads that stress the new code paths tend to be Pi 4/Pi 5 territory.
Why it matters
If you run Pi hardware as anything other than a toy — Pi-hole, home-assistant, kubernetes-at-home, retro-emulation frontends, small SBC clusters — kernel updates matter more than many buyers realize. Real-world workloads on the Pi 4 8GB see the biggest gains in I/O-bound tasks: fewer stalls when writing to a fast SD card or USB SSD, better sustained throughput on containerized workloads that stress the block layer. Thermal improvements matter for anyone running the Pi 5 near its clock ceiling.
Existing homelab operators can pull the update with a routine sudo apt update && sudo apt full-upgrade cycle followed by a reboot. Owners running out-of-tree kernel modules or hardware overlays should test on a dev SD card before rolling it to their production Pi.
The source
Phoronix's full benchmark suite comparing 6.12 and 6.18 on Pi 4 and Pi 5: Phoronix — Raspberry Pi OS 6.18 benchmarks. Official announcement and download links: Raspberry Pi OS. Hardware background: Raspberry Pi 4 Model B.
