You boot up your Steam Deck, excited to jump into your favorite competitive shooter, and instead of a lobby you get a vague error message. The game closes itself. No explanation, no fix button, no help. If you have been there, you are far from alone.
Anti-cheat systems are the number one reason games refuse to launch on Linux and the Steam Deck. Titles like Destiny 2, Valorant, and Rainbow Six Siege are completely off-limits. But many other games that use anti-cheat actually do work once you install the right runtime components.
In this guide, I will walk you through how anti-cheat systems function on Linux, why some games block you outright, and exactly how to fix the ones that are fixable. Whether you are on a Steam Deck in Gaming Mode or running desktop Linux, you will have a clear troubleshooting path by the end.
We will cover Easy Anti-Cheat, BattlEye, kernel-level systems like Riot Vanguard, Proton compatibility solutions, and the community tools that make Linux gaming navigable in 2026.
Table of Contents
How Anti-Cheat Systems Actually Work?
Anti-cheat software runs alongside a game to detect cheats, mods, trainers, and exploits before they ruin the experience for legitimate players. Think of it as a bouncer standing between your operating system and the game server, checking for tampering.
There are two main categories you need to understand: user-space anti-cheat and kernel-level anti-cheat. This distinction is the entire reason some games work on Linux and others never will.
User-space anti-cheat runs as a regular application inside the operating system. It monitors game memory and process behavior without needing special privileges. Easy Anti-Cheat and BattlEye both started this way, and both can operate in user-space mode through Proton on Linux.
Kernel-level anti-cheat goes deeper. It loads a driver into the operating system kernel, giving it the highest possible access to monitor everything happening on your machine. Riot Vanguard (used in Valorant), BattlEye in its kernel mode, and some configurations of Easy Anti-Cheat all use this approach on Windows.
On Linux, there is no stable kernel driver ABI. That means anti-cheat developers cannot write a kernel driver that will reliably load across different kernel versions, distributions, and configurations. This single technical limitation is why kernel-level anti-cheat breaks on Linux and why no workaround exists for affected games.
Easy Anti-Cheat: Status and Compatibility on Linux
Easy Anti-Cheat (EAC) is owned by Epic Games and used in dozens of major multiplayer titles. The good news is that Epic and Valve collaborated to build a Proton EasyAntiCheat Runtime that allows EAC to function on Linux through the Proton compatibility layer.
Here is the catch: developers must manually opt in. EAC on Linux only works when a game developer enables the Linux/Wine EAC backend in their Epic Online Services configuration. This is a checkbox in the EAC developer dashboard, but many studios never bother.
Games that have enabled EAC for Linux and work well include Halo: The Master Chief Collection, War Thunder, Mortal Kombat 11, Rust, and Fall Guys. These titles launch and play normally on both Steam Deck and desktop Linux.
Games that use EAC but have not enabled Linux support simply refuse to connect to servers or crash on launch. You might see an “Easy Anti-Cheat is not installed” error even when it is, because the game cannot verify the runtime against its server-side configuration.
BattlEye: Status and Compatibility on Linux
BattlEye is the other major anti-cheat system, used in games like ARK: Survival Evolved, DayZ, Rainbow Six Siege, and PUBG. Like EAC, BattlEye has a Proton BattlEye Runtime that Valve maintains for Linux compatibility.
The same rule applies here: the developer must enable BattlEye Linux support on their end. When they do, the Proton runtime handles the rest. BattlEye has been slightly more cooperative than EAC historically, with more games enabling support, though the landscape shifts with every update.
Games like ARK and DayZ work on Linux through the BattlEye runtime. Rainbow Six Siege, despite also using BattlEye, does not work because Ubisoft has not enabled the Linux backend. Same anti-cheat system, completely different outcomes based on a developer decision.
This is why checking compatibility before buying is so important. Two games using the exact same anti-cheat can have opposite statuses on Linux.
Why Kernel-Level Anti-Cheat Fails on Linux?
Kernel-level anti-cheat is the hard wall that Linux gamers cannot get around. Systems like Riot Vanguard, nProtect GameGuard, and some configurations of EAC and BattlEye load directly into the Windows kernel as a driver.
On Windows, this works because Microsoft maintains a stable driver ABI. A kernel driver written for Windows 10 will generally load on Windows 11 with minimal issues. The kernel interface is documented, versioned, and backwards-compatible.
Linux does not offer this. The Linux kernel has no stable internal ABI for out-of-tree drivers. Every kernel update can change internal structures, break undocumented interfaces, and require drivers to be recompiled. Anti-cheat developers would need to maintain drivers for every kernel version across every distribution, which is impractical.
This means games using Riot Vanguard (Valorant, League of Legends after its Vanguard integration) are effectively never coming to Linux or Steam Deck through Proton. The technology gap is fundamental, not a matter of Valve or Epic choosing not to support it.
From forum discussions across Reddit communities like r/linux_gaming and r/SteamDeck, the consensus is clear: kernel-level anti-cheat remains the single biggest barrier to Linux gaming adoption. Users report that games like Destiny 2 (which uses a custom anti-cheat with kernel components) are completely unplayable, and Bungie has shown no interest in enabling any form of Linux support.
Fixing Anti-Cheat Games on Linux and Steam Deck: Step-by-Step Solutions
If a game uses Easy Anti-Cheat or BattlEye and the developer has enabled Linux support, you just need to install the correct runtime. The fixes below cover the most common scenarios. If a game uses kernel-level anti-cheat with no Linux backend, no amount of troubleshooting will make it work, and I will be honest about that.
How to Install the Proton EasyAntiCheat Runtime
Installing the EAC runtime on Steam Deck or desktop Linux takes about two minutes. Here is exactly what to do:
Step 1: Open Steam and navigate to your game library. Find the game that uses Easy Anti-Cheat.
Step 2: Right-click the game and select Properties. On the Steam Deck, press the Options button (three-dot menu) and select Properties.
Step 3: Go to the Compatibility tab. Check the box that says “Force the use of a specific Steam Play compatibility tool.”
Step 4: Select Proton Experimental or the latest stable Proton version from the dropdown.
Step 5: Now go back to your Steam Library and search for “Proton EasyAntiCheat Runtime.” You can also find it by going to Steam menu > Settings > Compatibility and checking installed compatibility tools.
Step 6: If the runtime is not installed, go to the game’s installation folder, look for a folder called EasyAntiCheat, and run the EasyAntiCheat_Setup.exe through Proton. Alternatively, install the Proton EasyAntiCheat Runtime from the Steam store page (it is a free tool).
Step 7: Launch the game. If EAC loads correctly, you will see the EAC splash screen before the game starts.
If the runtime option is greyed out in Properties, try verifying your game files first. Right-click the game, go to Properties > Installed Files, and click “Verify integrity of game files.” Then retry the steps above.
How to Install the Proton BattlEye Runtime
The BattlEye installation process is nearly identical to EAC:
Step 1: Open Steam and find the BattlEye-protected game in your library.
Step 2: Right-click and select Properties.
Step 3: Go to the Compatibility tab and force a Proton version (Proton Experimental or latest GE-Proton).
Step 4: Search for “Proton BattlEye Runtime” in your Steam library. Install it if it is not already present.
Step 5: Launch the game. The BattlEye launcher should appear and connect normally.
Some users report that BattlEye runtimes occasionally break after Proton updates. If a previously working game suddenly stops launching, switching to a different Proton version (like GE-Proton) often resolves it.
Troubleshooting Common Anti-Cheat Errors
When anti-cheat games refuse to launch, the error messages are often unhelpful. Here is a diagnostic approach to figure out what is actually wrong:
Problem: “Easy Anti-Cheat is not installed” error. This usually means the Proton EAC runtime is missing or the developer has not enabled Linux support. Install the runtime first. If the error persists after installation, the game likely does not have Linux EAC enabled and cannot be fixed on your end.
Problem: Game launches but kicks you from servers immediately. This can happen if your Proton version is outdated. Switch to Proton Experimental or the latest GE-Proton build via ProtonUp-Qt. Some games are also sensitive to specific Proton versions, so check ProtonDB for community-reported working versions.
Problem: BattlEye initialization failed. Verify the Proton BattlEye Runtime is installed. Delete the game’s Proton prefix (found in ~/.steam/steam/steamapps/compatdata/[appid]) and relaunch. This forces a fresh prefix creation and often fixes corruption issues.
Problem: Game worked yesterday, broken today. Anti-cheat updates can break compatibility overnight. Check the game’s Steam community forums and ProtonDB to see if others are reporting the same issue. If so, it is a server-side or update problem, and your only option is to wait for a fix from the developer or Valve.
Diagnostic checklist: Is the game listed on ProtonDB as working? Has the developer enabled Linux anti-cheat support? Are you using the recommended Proton version? Have you tried deleting the compatdata prefix? Answering these four questions will resolve most issues.
Steam Deck vs Desktop Linux: Key Differences
The Steam Deck runs SteamOS, a Linux-based operating system, but the experience differs from desktop Linux in several ways that affect anti-cheat behavior.
In Gaming Mode, the Steam Deck uses a locked-down environment that closely mirrors how Valve intends Proton to work. This is the most reliable mode for anti-cheat games. Steam handles compatibility tool selection automatically, and games that support the Steam Deck will have their runtimes configured out of the box.
In Desktop Mode, you have full access to the underlying Arch Linux system. This gives you more control (you can install ProtonUp-Qt, manage prefixes manually, edit config files), but it also means you can break things more easily. Most troubleshooting steps should be done in Desktop Mode, then tested in Gaming Mode.
The Steam Deck’s read-only filesystem is another factor. By default, the root filesystem is immutable, which prevents accidental damage but also limits what system-level changes you can make. You can disable this with sudo steamos-readonly disable, but doing so risks breaking system updates.
Some users install Windows on their Steam Deck specifically for anti-cheat-blocked games like Valorant or Destiny 2. While this works, it sacrifices the optimized SteamOS experience, battery life, and quick-resume features. From community reports on Reddit, Windows on Deck feels functional but not great, with users describing it as a smoother experience for anti-cheat games specifically while preferring SteamOS for everything else.
Community Tools and Resources for Anti-Cheat on Linux
The Linux gaming community has built excellent tools to help you navigate anti-cheat compatibility. These are the resources I check regularly:
ProtonDB (protondb.com) is the gold standard for checking if any game works on Linux. Users submit reports with their hardware, Proton version, and specific issues. For anti-cheat games, ProtonDB reports will tell you whether the game connects to servers successfully or gets blocked.
AreWeAntiCheatYet (areweanticheatyet.com) is a dedicated database tracking anti-cheat game compatibility on Linux. It lists games by anti-cheat type, support status (Running, Denied, Broken, Planned), and notes. This is the fastest way to check whether a specific game will work before you buy it.
GamingOnLinux Anti-Cheat Database tracks over 247 games with anti-cheat and their Linux/Steam Deck status. It is community-verified and regularly updated, making it a reliable reference for checking current compatibility.
ProtonUp-Qt is a graphical tool for installing custom Proton builds, including GE-Proton. GE-Proton includes additional media codecs, fixes, and patches that the official Proton releases sometimes lack. For stubborn anti-cheat issues, switching to a GE-Proton build is one of the most effective troubleshooting steps. Install it via Flatpak on desktop Linux or through Desktop Mode on Steam Deck.
The Proton GitHub issue tracker at github.com/ValveSoftware/Proton is where technical issues are reported and tracked. If you are experiencing a bug, searching here will tell you whether it is a known issue and whether a fix is in progress.
Games That Work vs Games That Don’t
Here is a practical reference for what you can actually play. The landscape changes as developers enable or disable support, so always verify on AreWeAntiCheatYet or ProtonDB for the latest status.
Games that work on Linux/Steam Deck with anti-cheat enabled: Halo: The Master Chief Collection (EAC), War Thunder (EAC), Mortal Kombat 11 (EAC), Fall Guys (EAC), Rust (EAC), ARK: Survival Evolved (BattlEye), DayZ (BattlEye), Hunt: Showdown (EAC), and Deep Rock Galactic (EAC). These games have developers who opted in to Linux anti-cheat support.
Games that are blocked and unfixable: Destiny 2 (custom kernel anti-cheat), Valorant (Riot Vanguard), Rainbow Six Siege (BattlEye without Linux support enabled), Fortnite (EAC without Linux support enabled), and PUBG (BattlEye without Linux support enabled). No workaround exists for these titles on Linux.
Games that work but with caveats: Some EAC or BattlEye games work but may break temporarily after anti-cheat updates before Valve or the developer pushes a fix. Always keep an eye on community reports if your favorite game suddenly stops working.
How to check before buying: Search the game on AreWeAntiCheatYet first. If it says “Running,” you are good. If it says “Denied” or “Broken,” do not buy it for Linux play. If it says “Supported” or “Planned,” it may work now or in the near future. Cross-reference with ProtonDB for user-confirmed reports.
How to Request Anti-Cheat Support From Developers
Developer opt-in is the make-or-break factor for anti-cheat on Linux. If a game does not work, the single most impactful thing you can do is ask the developer to enable it.
For EAC games, the developer literally needs to check a box in their Epic Online Services dashboard to enable the Wine/Linux backend. For BattlEye, the process is similarly straightforward from the developer’s side. The technical barrier is low, which makes the lack of support a business decision rather than a technical one.
When contacting developers, be specific and polite. Use their official Discord, Steam community discussions, or support email. Mention that you play on Linux or Steam Deck, that the Proton runtime exists, and that enabling support requires minimal effort. Point them to Valve’s documentation on Proton anti-cheat runtimes.
Volume matters. When enough players request Linux support, developers take notice. Games like Deep Rock Galactic and Halo MCC added Linux anti-cheat support partly because of sustained community requests.
Avoid demanding or hostile language. Developers are more likely to enable support when the request comes across as a genuine opportunity to expand their player base, not an entitlement.
Frequently Asked Questions
Why doesn’t anti-cheat work on Steam Deck?
Anti-cheat fails on Steam Deck when a game uses kernel-level anti-cheat or when the developer has not enabled the Linux backend for Easy Anti-Cheat or BattlEye. The Steam Deck runs Linux through SteamOS, and games that require Windows kernel drivers cannot function. Games using EAC or BattlEye only work if the developer opts in to Linux support.
How to fix games not launching on Steam Linux?
First, force a Proton version in the game Properties under Compatibility. Install the Proton EasyAntiCheat or Proton BattlEye Runtime from your Steam library. Verify game files, try switching to GE-Proton via ProtonUp-Qt, and delete the compatdata prefix if the game still fails. If none of this works, the developer has likely not enabled Linux anti-cheat support.
Does BattlEye anti-cheat work on Linux?
Yes, BattlEye works on Linux through the Proton BattlEye Runtime, but only when the game developer has enabled the Linux backend. Games like ARK and DayZ work fine. Games like Rainbow Six Siege do not, because Ubisoft has not enabled Linux BattlEye support despite the technology being available.
How to fix Easy Anti-Cheat not launching?
Install the Proton EasyAntiCheat Runtime from Steam, force a Proton version in the game compatibility settings, and verify game files. If you still get an EAC error, the developer has not enabled Linux support and the game cannot run on Linux or Steam Deck through any workaround.
Will SteamOS ever support kernel-level anti-cheat?
Unlikely in the foreseeable future. Linux does not have a stable kernel driver ABI, meaning anti-cheat developers cannot reliably load kernel drivers across different kernel versions and distributions. Riot Vanguard and similar systems would require fundamental changes to how the Linux kernel handles drivers, which is not on the roadmap.
Can I get banned for playing on Linux or Steam Deck?
No. Playing through Proton on Linux or Steam Deck is not a bannable offense. Valve and anti-cheat providers have confirmed that using the official Proton runtimes is safe. You only risk a ban if you attempt to bypass or modify the anti-cheat system itself.
Moving Forward With Linux Gaming
Fixing anti-cheat games on Linux and the Steam Deck comes down to one question: did the developer enable support? If they did, installing the Proton EAC or BattlEye runtime gets you playing in minutes. If they did not, and especially if the game uses kernel-level anti-cheat, no workaround will help.
The landscape is improving. More developers are opting in every year, Valve continues to refine the Proton runtimes, and community tools like AreWeAntiCheatYet and ProtonDB make it easy to check compatibility before you buy. The games that remain blocked are held back by business decisions, not technical impossibilities (with the exception of true kernel-level systems like Vanguard).
Use the resources in this guide to check before purchasing, install the right runtimes for games that support Linux, and contact developers when your favorite game is missing support. Every request adds pressure, and every enabled game grows the Linux gaming library.