Ubuntu 26.10, nicknamed ‘Stonking Stingray’, introduces significant security enhancements including a streamlined Secure Boot, widespread adoption of memory-safe Rust utilities, and updates to cryptographic protocols, setting a new standard for resilient Linux distributions.
Ubuntu 26.10 places security at the centre of a broader shift in how the distribution is being built. The release, nicknamed “Stonking Stingray”, arrives as AI-assisted vulnerability discovery shortens the time between flaw discovery and exploitation, making hardening more than a matter of faster patching. Canonical’s answer is to shrink what an attacker can reach in the first place, while also increasing the use of memory-safe code and keeping sensitive functions confined. The company also frames the release as groundwork for Ubuntu 28.04 LTS, with security changes now intended to compound into a more resilient long-term platform.
One of the most visible changes is to the Secure Boot path. Canonical is trimming the signed GRUB build so that it contains only the components needed for common Ubuntu installations, removing support from the bootloader for several filesystem drivers, image formats and partition-table parsers that have historically widened the pre-kernel attack surface. Ubuntu says this affects only the boot chain: the removed capabilities still work once the system is up, and they remain available entirely if Secure Boot is disabled. The trade-off is deliberate, but it means administrators with customised /boot layouts need to check compatibility carefully before upgrading.
Ubuntu is also widening the use of hardware-backed disk protection. In 26.10, TPM-backed full disk encryption extends to machines that do not have a hardware root of trust, although those systems must use a PIN or passphrase at installation because Ubuntu cannot automatically verify firmware on them. Systems with a hardware root of trust, which Ubuntu says includes most PCs made since 2021, continue to unlock automatically. Canonical has also refined the firmware update flow in fwupd so that recovery-key prompts appear only when a firmware change could affect the measurements used for unlock, a change that has also been backported to Ubuntu 26.04 LTS.
A major part of the release is the move towards Rust across core system tools. Ubuntu 26.04 LTS had already made the Rust-based uutils coreutils the default while keeping GNU cp, mv and rm for compatibility. Ubuntu 26.10 finishes that transition, so the default command-line utilities now run entirely on Rust. Canonical argues that this reduces exposure to memory-corruption bugs such as use-after-free and out-of-bounds access, though it also warns that logic errors and flaws in unsafe dependencies can still exist. For administrators, the practical advice is to test scripts and privileged workflows that depend on subtle command behaviour before deploying widely.
The cryptography stack is changing as well. Ubuntu 26.10 moves to OpenSSL 4.0 and OpenSSH 10.5, continuing the distribution’s post-quantum work by preferring hybrid key exchange where peers support it and by exposing algorithms such as ML-KEM, ML-DSA and SLH-DSA. OpenSSL 4.0 also adds support for Encrypted Client Hello, though Ubuntu notes that enabling it in the library does not make every application use it automatically. At the same time, legacy interfaces are being removed or constrained, including the ENGINE mechanism, SSLv3 and some deprecated elliptic-curve handling. For organisations relying on HSMs, PKCS#11 tokens or TPM-backed keys, the message is clear: migration to OpenSSL’s newer provider model is now necessary.
Ubuntu is also replacing older infrastructure pieces that sit deep in the operating system. dbus-broker becomes the default message bus, displacing dbus-daemon after more than two decades, while retaining AppArmor mediation so confinement policies continue to govern what applications can send or receive. Canonical is similarly testing ntpd-rs, a memory-safe time daemon, with the stated goal of making it the default in Ubuntu 27.04; the company says it is funding development to help close feature gaps with chrony and to support stronger confinement. These changes matter because time and inter-process communication are both trust boundaries: failures there can undermine authentication, logging and policy enforcement.
Enterprise identity and privacy are being folded into the same security story. Ubuntu’s authd service now supports Microsoft password sign-in and multi-factor authentication via Microsoft Authenticator, while also deriving user and group identifiers from identity-provider attributes so permissions remain consistent across a fleet. NetworkManager has gained PKCS#11 and smart-card support, allowing hardware-token sign-in for VPN access. On the desktop, Ubuntu’s new Myna dictation feature processes speech locally through a sandboxed inference snap, keeping audio off the cloud and discarding it after use. The release ships with Linux kernel 7.3 and its associated hardening work, and Canonical says Ubuntu 26.10 will be supported until July 2027.
Disclaimer: This content is intended for informational purposes only. Readers are advised to exercise their own judgement, conduct due diligence, or consult a qualified expert before acting on any information provided.
