FreeBSD 15.1-Release Now Available

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FreeBSD 15.1-RELEASE Now Available

From: Colin Percival

Date: Tue, 16 Jun 2026 00:01:49 UTC

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FreeBSD 15.1-RELEASE Announcement

Date: June 16, 2026

The FreeBSD Release Engineering Team is pleased to announce the availability of FreeBSD 15.1-RELEASE. This is the second release of the stable/15 branch.

Some of the highlights:

* The iwlwifi(4) and other LinuxKPI based wireless networking drivers are now based on Linux v7.0.

* FreeBSD cloud images using packaged base systems now include pkg(8), and support automatic base system package updates on first boot.

* A new kern.sched.name tunable allows the kernel scheduler to be selected at boot time.

* Significant progress has been made towards complete support for the C23 version of the C programming language.

* Unicode support has been updated to Unicode 17.0.0 and CLDR 48, adding 4,803 characters.

For a complete list of new features, supported hardware, and known problems, please see the online release notes, hardware compatibility notes, and errata list, available at:

* https://www.FreeBSD.org/releases/15.1R/relnotes/

* https://www.FreeBSD.org/releases/15.1R/hardware/

* https://www.FreeBSD.org/releases/15.1R/errata/

For more information about FreeBSD release engineering activities, please see:

* https://www.FreeBSD.org/releng/

Dedication

The FreeBSD Project dedicates the FreeBSD 15.1-RELEASE to the memory of Peter G. Neumann, a longtime collaborator with FreeBSD developers on capability-based security, as well as having originated, through contributions to historic projects such as Multics, so many of the central concepts in OS security that we take for granted today.

Availability

FreeBSD 15.1-RELEASE is now available for the amd64, aarch64, armv7, powerpc64, powerpc64le, and riscv64 architectures.

FreeBSD 15.1-RELEASE can be installed from bootable ISO images or over the network. Some architectures also support installing from a USB memory stick. The required files can be downloaded as described below.

SHA512 and SHA256 hashes for the release ISO, memory stick, and SD card images are included at the bottom of this message.

PGP-signed checksums for the release images are also available at:

* https://www.FreeBSD.org/releases/15.1R/signatures/

A PGP-signed version of this announcement is available at:

* https://www.FreeBSD.org/releases/15.1R/announce.asc

The purpose of the images provided as part of the release are as follows:

dvd1

This contains everything necessary to install the base FreeBSD operating system, the documentation, debugging distribution sets, and a small set of pre-built packages aimed at getting a graphical workstation up and running. It also supports booting into a "livefs" based rescue mode. This should be all you need if you can burn and use DVD-sized media.

Additionally, this can be written to a USB memory stick (flash drive) for the amd64 architecture and used to do an install on machines capable of booting off USB drives. It also supports booting into a "livefs" based rescue mode.

As one example of how to use the dvd1 image, assuming the USB drive appears as /dev/da0 on your machine something like this should work:

# dd if=FreeBSD-15.1-RELEASE-amd64-dvd1.iso \ of=/dev/da0 bs=1m conv=sync

Be careful to make sure you get the target (of=) correct.

disc1

This contains the base FreeBSD operating system. It also supports booting into a "livefs" based rescue mode. There are no pre-built third-party packages.

As one example of how to use the disc1 image, assuming the USB drive appears as /dev/da0 on your machine something like this should work:

# dd if=FreeBSD-15.1-RELEASE-amd64-disc1.iso \ of=/dev/da0 bs=1m conv=sync

Be careful to make sure you get the target (of=) correct.

bootonly

This supports booting a machine using the CDROM drive but does not contain the installation distribution sets for installing FreeBSD from the CD itself. You would need to perform a network based install (e.g., from an HTTP or FTP server) after booting from the CD.

As one example of how to use the bootonly image, assuming the USB drive appears as /dev/da0 on your machine something like this should work:

# dd if=FreeBSD-15.1-RELEASE-amd64-bootonly.iso \ of=/dev/da0 bs=1m conv=sync

Be careful to make sure you get the target (of=) correct.

memstick

This can be written to a USB memory stick (flash drive) and used to do an install on machines capable of booting off USB drives. It also...

FreeBSD 15.1-Release Now Available

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