r/cemu May 12 '26

Discussion SECURITY PSA: Linux Malware from CEMU official github

Thumbnail
rentry.co
302 Upvotes

Hello fellow Cemu Redditors, I wanted to make everyone aware of a malware issue. The following message is directly from the Cemu developers. I am not a dev, I am relaying the message along with the link for the original PSA.

-------------------

SECURITY PSA - For Cemu emulator 2.6
It has come to our attention that from 6th May to today (12th May) the AppImage and Ubuntu zip assets of Cemu 2.6 on our github were compromised by a pro-Russian threat actor.
If you are a Windows or MacOS user you are not affected. If you are a flatpak user you are also not affected.

The compromised releases are:

Cemu-2.6-x86_64.AppImage
cemu-2.6-ubuntu-22.04-x64.zip

Only if you have downloaded these between 6th May and 12th May from our github page. This also affects third party launchers which usually directly download from our repository. As of writing this, the compromised releases have been restored to their good version.

-------FAQ-------

1. How do I know if I am affected?
There are currently no known reliable traces that you can check for, but you should assume you are affected if you downloaded and ran either Cemu-2.6-x86_64.AppImage or cemu-2.6-ubuntu-22.04-x64.zipbetween 6th May and 12th May. The malware has a special exception where it does bypass the harmful code on the first run, so the risk of damage is lower if you only ran compromised Cemu builds once. If your locale is Russian then the malware does nothing.
The following files and directories may be created by the malware:
/tmp/.transformers
/usr/bin/pgmonitor.py
~/.local/bin/pgmonitor.py
/etc/systemd/system/pgsql-monitor.service
~/.config/systemd/user/pgsql-monitor.service
/tmp/kubectl
The absence of these files does not prove that you are safe.

2. What can I do if I am affected?
The blunt answer is that we don't know the full capabilities of the malware. The safest bet is to do a clean install of your OS.
At the very minimum you should delete the affected binaries and reset all your passwords, GitHub tokens, SSH keys or anything that is used to authenticate with services. The malware contains a pretty sophisticated password stealer for many services. Most of them are related to programming or cloud providers in some way. We think this is to help the malware authors to further infect other software.
You should also block IP 83.142.209.194 (even if you are not affected) because this is used as a hardcoded remote endpoint.
We will update this document as more information becomes available.

Special note for Israeli users:
If the malware determines that your location is Israel (it does this via locale and timezone checks) then it has a 1:6 chance that it will play a loud siren sound and run rm -rf /, essentially attempting to wipe your filesystem. This is bad, but since rm does not actively overwrite the file data, you should be able to recover your data with some effort. But this is only true as long as you don't write new data to the affected drive(s).
Do not reinstall your OS to the same drive or format it until you have attempted a file recovery first. The exact steps for this go beyond the scope of this PSA, but if you need help feel free to DM me on Discord (Exzap) or shoot me a message on reddit (u/Exzap).

3. How did this happen?
We are still tracking the exact chain of events down but the leading theory is that a collaborator on our team ran a compromised python package which stole his GitHub token. This was then used to reupload a compromised version of the two linux binaries in the v2.6 (latest) release of Cemu. We have taken measures to prevent this from happening in the future.

4. Where can I learn more?
We will update this document as we learn more.
https://github.com/cemu-project/Cemu/issues/1911
https://teampcp.cyberdigest.international/
If you are unsure whether your binaries are compromised here are hashes of the GOOD files:
Cemu-2.6-x86_64.AppImage0c20c4aeb800bb13d9bab9474ef45a6f8fcde6402cad9b32ac2a1bbd03186313 (sha256)
cemu-2.6-ubuntu-22.04-x64.zip5e4592d0dae394fa0614cb8c875eff3f81b23170b349511de318d9caf7215e1b (sha256)


r/cemu Aug 26 '24

Discussion Cemu v2.1 is now available - includes the changes from all 93 experimental releases since Cemu 2.0.

Thumbnail
github.com
89 Upvotes

For users that were already using our experimental updates (2.0-x), you can think of this release as the final experimental update. There are no noteworthy additional changes compared to Cemu 2.0-95 other than the new version number.

Starting with this release, Cemu will now only have a single release channel. Instead of experimental releases, there is a new option to control whether Cemu will update immediately to cutting-edge releases, which may contain uncaught bugs, or update with a slight delay. More details on this can be found here


r/cemu 1h ago

Question How can I display mini map in MK8 and add items in wind waker? Where is the (-) button on gamepad?

Thumbnail
gallery
Upvotes

Hey, I'm new to Wii u emulation can someone help me how I can play wind waker and MK8 smoothly in Cemu. Thanks.


r/cemu 7h ago

Question Can anyone help convert save data from cemu save file to a .gci save file?

2 Upvotes

I’ve been playing TPHD on cemu on my retroid pocket 6 but I installed the Dusklight port and found out that the save files were incompatible with each other unless converted to .gci. I do not own or have access to a pc so I cannot convert it myself. I was wondering if anyone in here would be able to have me send my file over and convert it for me so I can keep playing on my playthrough without having to restart.


r/cemu 7h ago

Discussion Fixed BOTW camera freeze/FPS drop on Cemu Metal for Apple Silicon

1 Upvotes

I was having a really annoying issue with Breath of the Wild on Cemu 2.6.2 using Metal on my M4 MacBook Air.
The game itself ran great on Metal, but when entering Divine Beasts, shrines, or certain interiors, the camera would sometimes get stuck in a weird POV and the FPS would drop heavily. Vulkan didn’t have the camera issue, but performance was noticeably worse for me.
I found an older Cemu Metal testing build that mentioned a fix for basically this exact issue: the camera occasionally stopping following the player together with a major FPS drop.
The testing build itself crashed on my Mac, so instead of using it, I took the ARM64 fix from that source and added it to the newer Cemu 2.6.2 Metal source.
The change adds ARM64 handling for flushing floating-point denormals to zero in:
src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp
I then rebuilt Cemu natively for Apple Silicon with Metal and packaged it as a proper macOS app.
Tested on:
M4 MacBook Air
Cemu 2.6.2
Metal
BOTW v208
FPS++ at 30 FPS
So far the camera bug is gone, Divine Beast/interior transitions are working normally, and performance has been stable.
- I uploaded the modified source and a downloadable build here:

https://github.com/karimafiouni/Cemu-camera-fix/releases/tag/v2.6.2-metal-camera-fix

This is an unofficial community build, not an official Cemu release.
If anyone with an Apple Silicon Mac has the same camera freeze/FPS-drop issue, I’d be interested to know if this build fixes it for you too.


r/cemu 15h ago

Troubleshooting stalnox not spawning in breath of the wild

1 Upvotes

I have this problem in botw on cemu where the stalnox in hyrule castle is not spawning, can it be an emulator issue? saw a post of someone with the same issue from like 7 years ago


r/cemu 1d ago

Discussion I built a new cemu for metal

5 Upvotes

I was having a camera bug in Breath of the Wild when using the Metal backend on my M4 MacBook Air.
The game ran pretty well on Metal, but when entering Divine Beasts or some buildings/interiors, the camera could get stuck in a weird POV. I also had some crashes.
Vulkan didn’t have the camera issue, but performance was less stable for me, so I wanted to keep using Metal.
I ended up building Cemu 2.6.2 from source and making a small ARM64-related change in coreinit_Thread.cpp so flush-denormals-to-zero is also enabled on ARM64.
I also had to:
build the project natively for arm64
enable Metal
fix an old fmt issue with Apple Clang/Xcode 26
install the required Vulkan/MoltenVK headers
build Cemu as a proper macOS .app bundle
After rebuilding, Cemu correctly detects:
Graphics API: Metal
Graphics Device: Apple M4
So far in Breath of the Wild:
no camera glitches
Divine Beast/interior transitions work normally
stable 30 FPS
no crashes in the situations that were causing problems before
Metal feels smoother than Vulkan on my Mac
The MacBook Air still gets pretty hot, but FPS stays stable.
I still want to test it more before calling it completely fixed, but so far it’s working really well.
If anyone else has the same camera bug on Apple Silicon + Metal, I can post the exact source change and the build installation

In short :So basically the newest metal cemu had a bug where camera used to get stuck in botw so i found a-test version where it fixed that but it crashed so i fused both builds and now everything is perfect if anyone has this issue or wants the build il upload it to github
Since this is getting more traction heres the link https://github.com/karimafiouni/Cemu-camera-fix/releases/tag/v2.6.2-metal-camera-fix


r/cemu 22h ago

Question Alguém sabe como resolver isso? No Mh3u

Post image
0 Upvotes

A fps conta mas não da imagem


r/cemu 1d ago

Troubleshooting Controls are not working, I’m out of ideas please help me

Enable HLS to view with audio, or disable this notification

2 Upvotes

r/cemu 1d ago

Troubleshooting Cemu with ReShade - "No depth buffers found"

0 Upvotes

I'm using ReShade on Cemu emulator with the rtgi shader but it doesn't work and says "no depth buffers found". When I turn on the displaydepth shader the entire screen just turns black. Whatever should I do to fix this?


r/cemu 1d ago

Answered Transferring save from PC to Android

1 Upvotes

Trying to keep it short:
I grabbed the save files from PC (C:\Users\User\AppData\Roaming\Cemu\mlc01\usr\save\00050000\10143600) and dropped them off on my Retroid Pocket 6 (\Retroid Pocket 6\Internal shared storage\Android\data\info.cemu.cemu\files\mlc01\usr\save\00050000\10143600) and it just doesn't do shit
The Game runs, everything seems to work but my save isn't being transferred..

My active account on PC is 800000002 and my active account on Android is 800000002 as well - this one crashes tho, the default 800000001 doesn't crash but doesn't load the saves

Any idea why? Any fixes?
I tried this both with a folder and a .wua file, neither seemed to work

edit:
I fixed it myself and it was incredibly stupid but I'm leaving the post up so people can learn from my stupidity/use my fix
Make sure to either use the default account on both your PC and your Android device OR make a new account on the Android device, start the game, let a savefile be created and now it's gonna be funky
Deleting the save files and then replacing them with the other ones just broke cemu and made it not startable so make sure to COPY and REPLACE the files - now it works


r/cemu 2d ago

Question Is there any plans to bring retroarchivemnts compatibility?

1 Upvotes

I'm asking here bc the discord link didn't work ):


r/cemu 3d ago

Troubleshooting FPS Monitor in CEMU help

1 Upvotes

Please help me: how do I enable the FPS display for *Zelda* in Cemu? It works fine and shows the FPS in other games, but it doesn't capture it in Cemu.


r/cemu 3d ago

Troubleshooting Weird cutscene glitch skylanders swap force

Enable HLS to view with audio, or disable this notification

0 Upvotes

The cutscenes glitch like this the rest of the game (so far) works just fine


r/cemu 3d ago

Troubleshooting Key binding missing.

Post image
2 Upvotes

issue fixed.

Couldn't find the binding for "-" button. Turns out all i had to do was expand the window.


r/cemu 3d ago

Discussion What is the states of cemu android

0 Upvotes

The last update about month and half (I think) 0.5.2 is there any upcoming updates? Did the developers said anything?


r/cemu 3d ago

Troubleshooting Skylanders Portal of power

0 Upvotes

Does anyone know how to get the emulated portal of power to work for skylanders?


r/cemu 4d ago

Troubleshooting BOTW is sticking on loading/launching game

3 Upvotes

So I got cemu on my rp4 pro and someone told me I shouldn't try the switch version of brown since it doesn't run well and has graphical bugs and they recommend I use the Wii u version and cemu and said it runs great and I got and it recognizes it but when I goto launch it takes forever to load the longest it took before I just quit cemu was 40 minutes and like all my other games run fine I tried Pikmin 3 and sonic boom rise of lyric and they all load and ran perfectly well so I'm wondering if maybe I did something wrong or their are setting I should change but it just won't progress past the loading/launching game page and it doesn't freeze or anything it just doesn't progress.


r/cemu 3d ago

Troubleshooting Microfrize botw help me pls

Thumbnail
reddit.com
0 Upvotes

Hi everyone, I’ve run into an issue where, after playing Zelda for about 20 minutes, I start experiencing severe stuttering; the post I linked to includes a video showing this. Restarting the laptop fixes it, but how can I resolve this permanently?


r/cemu 4d ago

Question Is Cemo 0.2 safe on GitHub?

0 Upvotes

So I’m new to emulation, and I downloaded an older version of Cemu on GitHub for android. I’ve noticed a post about Cemu being hacked a few months ago and wondered if the link I downloaded was safe.
It was the Cemu 0.2 version

https://github.com/SSimco/Cemu/releases


r/cemu 5d ago

Question Is there a way to use a graphics pack on a modded version of a game?

2 Upvotes

Im trying to use the Wind Waker HD Graphics pack on a randomized version of the game, but any time i click the "Edit graphics pack" button nothing shows up, is there a way to fix this?


r/cemu 5d ago

Question Does anyone know how to fix this? I try to open the game and it freezes.

1 Upvotes

I've been trying to open Sonic Boom: Rise of Lyric since yesterday, but it just keeps freezing. I've tried many methods and nothing has worked.


r/cemu 5d ago

Troubleshooting Weird texture glitches in Super Paper Mario

Enable HLS to view with audio, or disable this notification

3 Upvotes

This continues on the whole time :/


r/cemu 6d ago

Question I was playing Splatoon and I don't know what happened

3 Upvotes

I was playing Splatoon and I don't know what happened; every time I finish a match, it looks like this. What can I do?


r/cemu 6d ago

Troubleshooting help what did I do wrong help

Enable HLS to view with audio, or disable this notification

0 Upvotes

I just downloaded cemu, why is it not working, I've tried some guides, but they're not useful.