Linux 6.19 arrives, closes out 6.x era with cloud-focused updates

Linux kernel 6.19 has been released, marking the end of the 6.x series and opening the merge window for Linux 7.0. Linus Torvalds said the final week of the cycle was uneventful, allowing the release to land on schedule, and confirmed the next kernel will be branded 7.0.

The release adds initial support for Intel's linear address-space separation (LASS) to help block side-channel exploits, and introduces Arm's MPAM for finer memory and cache control. A new listns() system call lets userspace enumerate namespaces directly, restartable sequences have been reworked for better robustness under contention, and Ext4 now supports larger block sizes plus smarter POSIX ACL checks that can reduce unnecessary permission lookups and, in some tests, improve file reads by up to 50%.

Networking received a redesign of the transmit-path locking scheme, replacing a busy lock with a lock-less list for heavy TX workloads that can raise throughput substantially in demanding environments.

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