Linux 7.3 opens its merge window as an LTS candidate and finishes sched_ext

Linux 7.3’s merge window opened in mid-August 2026 with 1,250 memory-management patches, a feature-complete sched_ext and initial support for AMD UALink and the Apple M3. Admins under memory pressure have two concrete fixes — rmap_walk_ksm and zsmalloc — to plan for before the expected October 2026 release.