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Linux kernel 7.0 will enable Intel Transactional Synchronization Extensions (TSX) by default on capable CPUs not affected by TAA and similar vulnerabilities. SUSE has shipped kernels with TSX enabled for 6 years without issues, and newer Intel processors (Cooper/Ice Lake, Sapphire/Emerald/Granite Rapids) don't have the TAA vulnerability. The change switches the default TSX mode to auto, enabling it on safe systems while keeping it disabled on vulnerable ones.

Linux 7.0 Looks To Enable Intel TSX By Default On Capable CPUs For Better Performance