The Linux Kernel 6.15 was released on May 25, 2025, and it brings a host of enhancements – hardware support, performance improvements, better security, and improvements on the filesystem management. Below is a comprehensive overview of its key features:
1. Core Enhancements
Feature
Description
Rust DRM Driver
Introduces the NOVA driver, the first Rust-written DRM driver for NVIDIA RTX 2000+ series, enhancing memory safety.
FWCTL Subsystem
New secure framework for user-space RPC communication with firmware.
Zero-Copy Networking
Enables direct packet transfers to user-space memory using io_uring, reducing CPU load.
SELinux Wildcards
Adds wildcard matching for network interfaces, improving security policy flexibility.
2. Hardware and Driver Support
Hardware
Update
Apple Silicon
Touchscreen & Touch Bar support for M-series Macs.
Intel Xe / Arc
SVM, thermal readings, and GPU ‘wedged’ event detection added.
Other Devices
New support for Xbox Turtle Beach controllers, Killer E5000 NICs, and MacBook Touch Bar
3. Performance Improvements
Area
Enhancement
exFAT
Massive boost in file deletion speed – from 4+ minutes to under 2 seconds.
AMD Zen 5
Optimized AES-CTR encryption for better cryptographic performance.
Boot Time
New hugetlb_alloc_threads speeds up boot initialization.
turbostat
Scales to support up to 8192 CPU cores.
4. Filesystem and Storage Enhancements
Component
Update
Bcachefs
Moves closer to production-ready status with a soft format freeze and self-healing features.
Zstandard
Upgraded to v1.5.7, improving compression speed and reliability.
Block Layer
Supports hardware-wrapped inline encryption keys.
5. Security and Memory Management
Feature
Description
io_uring SELinux
New hook lets SELinux apply fine-grained policy checks.
Memory Tuning
New defrag_mode sysctl helps reduce hugepage fragmentation. Locking structures refactored for efficiency.
6. Developer Tools and Infrastructure
Tool
Update
Python 3.9+
Minimum requirement for building and docs.
Fanotify
API now tracks mount/unmount events for real-time monitoring.
If you’re excited to try out Linux Kernel 6.15, you can now download the source code from kernel.org and build it yourself. But users of rolling release distributions such as Arch Linux will be the first to get the update in their OS automatically, as it’s expected to appear in their system updates within the next few days or weeks.
