Valve ships SteamOS 3.9.5 stable with Plasma 6.7.3 and Linux 7.2
The stable update also revokes compromised eMudhra CA certificates and improves Steam Frame wireless adapter support.
Valve released SteamOS 3.9.5 as a stable update for all users across all supported systems on October 24, 2026, according to GamingOnLinux. The release moves Desktop Mode from Plasma 6.4.3 to Plasma 6.7.3 and rebases the Linux kernel on Linux 7.2.
On the handheld side, idle power consumption on Steam Deck is improved when no audio is playing. Support for the Steam Frame wireless adapter is also improved, and preliminary hibernation support was added, though it is not exposed in the Game Mode UI.
The update includes a security fix: compromised eMudhra CA certificates were revoked. The WiFi backend now defaults to wpa_supplicant.
Several compatibility problems were addressed. A bug that caused certain games, including Elden Ring and Dark Souls III, to fail on recent Panther Lake Intel CPUs was fixed, as was a crash when launching Forza Horizon 6 on Legion Go 2. Preliminary support for Legion Go 2 brightness control was added.
Under the hood, scripts and packages were renamed from steamos- to holo-, with aliases kept for the old names, and support for running SteamOS as a VM guest with accelerated graphics was improved.
Previous desktop base
Before this release, SteamOS used a Desktop Mode based on Plasma 6.4.3.
Quick answers
What Plasma version does SteamOS 3.9.5 use?
SteamOS 3.9.5 upgrades Desktop Mode to Plasma 6.7.3, up from Plasma 6.4.3.
Which Linux kernel is SteamOS 3.9.5 based on?
The release is rebased on Linux 7.2.
Does SteamOS 3.9.5 fix Elden Ring on Intel Panther Lake CPUs?
Yes. A bug causing certain games, including Elden Ring and Dark Souls III, to fail on recent Panther Lake Intel CPUs was fixed.