Linux keep moving forward with the development of its next stable version and, in this context, Linus Torvalds has released la seventh release candidate (rc7) of kernel 6.15This new release marks an important step toward the final release and focuses primarily on incorporating numerous fixes and improvements related to security and compatibility with newer hardware.
During this phase, the development team has placed special emphasis on address vulnerabilities and prepare the ground for new processorsThe changes come after a week in which, although some significant changes have occurred, the overall stability of the kernel appears to be well under control.
Linux 6.15-rc7 introduces security updates relevant to Intel and ARM64
One of the most notable new features in Linux 6.15-rc7 is the Integration of new security mitigations against the Training Solo vulnerability, which affects certain Intel processors and ARM64 cores. In both cases, patches have been added to strengthen system protection, limiting exposure to attacks that exploit specific weaknesses in CPU speculative execution.
Specifically, The kernel incorporates the BHB mechanism for ARM64, also applied to JITted programs for cBPF, which strengthens defense against unprivileged users. These improvements are available alongside patches already distributed in previous stable releases such as Linux 6.14.7, and are now being extended to the 6.15 development cycle.
Getting started with AMD Zen 6 support
Another significant novelty is the Introduction of a synthetic feature flag 'ZEN6', designed to allow different kernel subsystems to identify future AMD Zen 6 processors. While this change doesn't enable new features immediately, it marks the starting point for more comprehensive support in future releases, as other components will be able to identify this architecture thanks to the early integration of this signaling.
La implementation of the ZEN6 brand This has been implemented as part of the urgent fixes for the x86 architecture, without compromising compatibility with previous generations of AMD CPUs. This prepares the kernel to facilitate future support for the next-generation Ryzen and EPYC processors expected in 2026.
General fixes and improvements to drivers and file systems
Along with updates to security and hardware support, Linux 6.15-rc7 incorporates various corrections in areas such as the Bcachefs file system and DRM graphics drivers, among others. This reflects the usual maintenance work focused on polishing details discovered during development branch testing, minimizing regressions, and fine-tuning the behavior of key system components.
As Torvalds has pointed out, the week has been relatively quiet As for changes, the flow of patches related to CPU mitigations remains a constant focus. The bulk of the additional changes is minor and aims to consolidate the kernel's robustness before the final release of version 6.15.
If no unexpected setbacks arise, The stable version of Linux 6.15 could be available next weekend.Otherwise, there would be an eighth release candidate before proceeding with the final release. The focus on security, support for future architectures, and bug fixes in development make this release a crucial step in the kernel's evolution.